Who We Are
Amy & Ronnie Diem
Owners
Accreditation
The AAAHC Certificate of Accreditation demonstrates an organization’s commitment to providing safe, high-quality services to its patients. AAAHC leads accreditation for ambulatory health care through nationally recognized quality improvement standards and a survey experience founded on a peer-based, educational approach to onsite review. The AAAHC Mission: To encourage and assist ambulatory health care organizations to provide the highest achievable level of care for recipients in the most efficient and economically sound manner.
What We Do
We are a locally and veteran-owned medical facility offering both Walk-In and Primary Care Services. At Coastal Medical, our focus is on delivering comprehensive, personalized healthcare to meet the needs of our community.
Patient-Centered Care
At Coastal Medical, we prioritize a patient-centered approach to healthcare, focusing on your unique needs. Our goal is to create a healthcare partnership that empowers you to take control of your health. We listen to your concerns, address your individual needs, and collaborate with you to create personalized care plans that evolve as your health changes. Our commitment is not just to help you get well but to ensure you stay well throughout your healthcare journey.
Referrals & Specialist Coordination
When your healthcare needs extend beyond our services, we ensure seamless transitions by coordinating referrals to trusted specialists. Whether you require care from a cardiologist, orthopedist, or another specialist, we work closely with them to manage and monitor your overall health. We stay involved every step of the way, making sure your care is continuous, comprehensive, and tailored to your needs.
Our Staff
Our Providers
Ronnie Diem, PA-C
Physician Assistant
I’m Ronnie, a certified Physician Assistant here at Coastal Medical. I grew up in Dover and graduated from Dover High School. I’m also a proud US Army Veteran, having served as an Airborne Medic in a Combat Arms Unit.
At Coastal Medical, I provide essential medical care, including diagnosing illnesses, developing treatment plans, and offering a wide range of healthcare services to our patients. I work closely with the medical team to manage both acute and chronic conditions, perform physical exams, and assist with minor procedures, ensuring that every patient receives comprehensive and compassionate care.
When I am not at work, I enjoy coaching lacrosse, going to the beach, and spending time with my family and friends.
Gabrielle Howlett, PA-C
Physician Assistant
I’m Gabrielle, a certified Physician Assistant. I graduated from Pfeiffer University in North Carolina from the Physician Assistant program in May 2024. I’m passionate about helping patients and providing them with the resources they need to get better.
When I’m not at work, I love spending time with my dog, who I couldn’t imagine living without. If I could travel anywhere in the world, I’d love to go to Thailand and participate in an elephant rescue. My favorite treat is Reese’s—definitely my go-to snack!
Fidel Romo-Martinez
MSN, APRN, FNP-C
Born and Raised in Southern California, I received a football scholarship to play Division 1 Football at Delaware State University. I graduated Valedictorian of the graduating class in 2019 with a Bachelors of Science in Biology and a minor in Chemistry. In 2021, I completed Thomas Jefferson University’s FACT-1 accelerated Nursing program. I worked as a registered nurse at a Level 1 Trauma hospital known as Thomas Jefferson University Hospital for three years in an intermediate Neurology Intensive Care/ Spine Orthopedics Unit. While working as a registered nurse, I enrolled in Thomas Jefferson’s Family Nurse Practitioner program and graduated in May 2024. While in the program, I developed a strong interest in Outpatient Family and Acute Care Medicine. As a Nurse Practitioner, I am dedicated to providing high-quality care to my patients. With a strong educational background and a commitment to ongoing learning, I strive to stay at the forefront of medical advancements in order to offer the best possible care. As a prior bedside nurse, I have seen patients at the end of life and during their moments of wishing they had listened to prior medical advice and I’m here to partner with you to aid in the prevention of chronic disease development or progression while utilizing the most up to date evidence-based practice.
During my free time I enjoy spending time with my wife biking at different parks, traveling, and exercising.
Patricia Leidy
NP
I’m Tricia, a Family Nurse Practitioner here at Coastal Medical. I’ve been in Delaware most of my life, but was an Air Force bonus kid who got to live in several states growing up. Pennsylvania will always be my home where I spent most of my summers with my grandparents who had a huge influence on my life. My Grammy was a nurse at LGH and encouraged my empathetic skills to care for people with passion and dedication. I graduated from DelTech in 1996 with my LPN and was 1 of only 5 people granted immediate admission to the RN program based on my academic standing. I worked over 23 years in Long Term Care in various roles which included Medicare/Medicaid reimbursement, Director of Nursing, and consulting for facilities. I earned my Masters as a FNP in 2024 and joined Ronnie at the CWI. In February of 2026, I became certified to complete DOT physicals to better serve our community at the walk-in.
In my spare time I enjoy spending time with my husband and sons or planning my next travel adventure!
Brittany Nunes
FNP
I am a Family Nurse Practitioner born and raised locally in Bowers Beach, Delaware, and currently living in Harrington with my significant other, son age 2, and stepdaughter age 13. I began my nursing journey at Delaware Technical and Community College in Georgetown, earning my Associate Degree in 2017 and Bachelor’s Degree in 2021. My experience as an RN includes: Bayhealth Step-down Unit, Sussex Correctional Institution, Post Acute Medical Rehabilitation Center and Woodbridge Early Childhood Education Center providing well-rounded, diverse, and multi-level age appropriate training. I recently completed my Master of Science in Nursing and FNP degree from Chamberlain University in February 2025. I became board certified by the American Association of Nurse Practitioners (AANP) following graduation and I am an active member of the AANP. I am also a member of the American Heart Association as a BLS instructor.
With a strong belief in holistic, compassionate care, I strive to connect with my patients on both a physical, spiritual, and emotional level. Outside of work, I enjoy fishing, camping, gardening, live music, and spending quality time with my family. During the summer months you can find me near a body of water as much as possible or watching the Phillies play. My long-term goal is to continue expanding my medical and homeopathic knowledge to better serve the health and wellness needs of our community. I look forward to building healthy relationships with my patients and giving back to the community that raised me and inspired my journey into advanced nursing practice.
Yessica Martinez
FNP
Yessica is a board-certified Family Nurse Practitioner. Dedicated to pediatric care, she focuses on early detection and interventions to ensure the best possible patient outcomes.
Born in Altus, Oklahoma, Yessica moved to Camden, DE, in 2000 due to her father’s military career. Her deep interest in health and science led her to earn a Biological Science degree, with a Chemistry minor, from Delaware State University (DSU), where she also contributed as a second author on published research regarding Alzheimer’s and Parkinson’s diseases.
Yessica holds an additional bachelor’s degree in nursing and a master’s degree as a Family Nurse Practitioner from Thomas Jefferson University. Before becoming a Family Nurse Practitioner, she gained valuable experience as a bedside nurse on a Level 1 Trauma Medical Surgical unit at Thomas Jefferson Hospital in Philadelphia, PA.
Yessica gained pediatric experience through her clinical rotation and work experience at Bright Future Pediatrics. Yessica is thrilled to bring her experience, resources and expertise of Pediatrics to Coastal Medical Primary Care.
In her free time, Yessica enjoys traveling, exercising, and biking with her husband, Fidel, who is also a provider within the Coastal Medical Group.
Brooke Zingone
FNP
Harold Spangler, MD
Medical Director
I’m Dr. Harold Spangler, and I serve as the Medical Director of Coastal Medical. I oversee our clinical operations to ensure we’re delivering high-quality medical services to our patients. With a strong background in patient care, I provide leadership to our medical team while also offering direct care to patients. My goal is to ensure that Coastal Medical stays at the forefront of healthcare, providing both urgent care and primary care services that our community can rely on.
Medical Assistants and Nurses
Kirby Brown
Medical Assistant
I’m Kirby and I was born and raised in Delaware. I began my medical assisting career in 2017 after graduating from Harris School of Business. I have a passion for helping others, and I always strive to go above and beyond to ensure my patients are well taken care of. On the primary care side, I work hard to keep things organized and running smoothly. With over seven years of experience as a medical assistant, I’m confident you’ll be in great hands. I’m here to help facilitate your needs, whether it’s scheduling appointments, handling medication refills, or making sure your questions are answered.
When I’m not in the office, I love spending time with my husband and two children. We enjoy going to the beach and are always looking for new family activities to try!
Katelyn Curtis
Medical Assistant
I’m Katelyn and I am a medical assistant here at the clinic. When you visit our walk-in, I’ll be the one greeting you with a smile and assisting you throughout your entire visit. With over six years of experience, I take pride in providing knowledgeable, compassionate care. Family is a priority for me, and I aim to offer that same level of care and attention to every patient I meet, making sure you feel comfortable and at home during your time with us.
Outside of work, I love spending time with my family, playing with my two dogs, Bleu and Jaxe, and unwinding with a good book.
Cheyenne Cain-Savage
Medical Assistant
Born and raised in Houston, Delaware, I also spent a few years living in Oklahoma, which gave me a broader perspective on different communities and lifestyles. I graduated from Milford High School in 2018 and went on to complete the CCMA program at Polytech in 2019, beginning my journey in the medical field.
I have a strong passion for patient care and am committed to continuously learning and growing within healthcare. In my free time, I enjoy traveling, spending time with friends, and making the most out of life. I value meaningful connections, new experiences, and bringing a positive attitude into everything I do—especially when caring for others.
Katie Combs
Medical Assistant
Born and raised right here in Felton, I’ve always had deep roots in our community. While I spent 15 years in the saddle—including a decade competing competitively in barrel racing—my career path after high school was an open road. Finding my way into pediatric medicine changed everything. I love connecting with patients of all ages. Following the closure of my previous pediatric office, I am thrilled to bring that same dedication and local spirit to the community that raised me and to my team at Coastal Primary Care and Walk-In
Sam Gerini
Medical Assistant
Hi, I’m Sam! I am a medical assistant who tries to keep things running smoother than a pumpkin spice latte machine in October. Born and raised in Philadelphia, I am a die-hard Eagles fan who firmly believes “Go Birds” is both a greeting and a lifestyle.
After moving to Delaware in 2018, I graduated from Sussex Technical High School in 2020 and continued my education at University of Delaware, where I earned my Associate’s degree in 2022. I take pride in my work as both a CNA and CCMA, with experience spanning hospital care at Beebe Healthcare, as well as long-term care, primary care, and urgent care settings.
Working in healthcare means no two days are ever the same—one minute you’re saving the day, the next you’re fixing the printer, and somehow both feel equally heroic. I love caring for my patients and making them smile, even if it’s just with bad jokes and an overabundance of bandages. My goal is simple: to make sure everyone leaves feeling better than when they came in—mentally, physically, and maybe with a fun sticker & lollipop for surviving it all.
When I’m not at work helping my patients, I’m booking cruises like I’ve never heard of bills, trying to adopt animals that absolutely already have homes, walking around car shows in the summer yet thinking about hoodies and spooky season, and eating at new restaurants like Gordon Ramsay might pull up and ask for my opinion.
Jill Jones
Medical Assistant
I’m Jill and I was born and raised here in Delaware. Im a compassionate and dedicated healthcare professional. I began my journey in the medical field shortly after graduating high school. After earning my CNA certification, I spent nearly three years working in a rehabilitation facility caring for geriatric patients. During that time, I developed a strong passion for helping others. Looking to expand my skills and continue growing in healthcare, I transitioned into a Medical Assistant role here at Coastal Medical, where I now work in the walk-in clinic. In this fast-paced environment, I enjoy caring for patients of all ages and value the opportunity to make a positive impact on people’s health and well-being every day. Outside of work you can find me spending time at the beach or getting fresh air on long walks with my dog.
Crystal Manning
Medical Assistant
Hi, I’m Crystal Manning, a Medical Assistant at Coastal Medical Center, a private family practice. I bring over 10 years of experience in healthcare and take pride in creating a warm, welcoming environment for every patient. I’m known for my friendly and compassionate approach, and I truly enjoy helping people feel comfortable and cared for during their visits. Outside of work, I’m a proud mother to four young men, which keeps me busy and grounded every day.
Carolina Perez
Medical Assistant
I’m a Jersey girl now enjoying life in Delaware with my wonderful boyfriend and our sweet but chaotic pup, Remi. I graduated from William Paterson University’s Medical Assistant program in 2019 and became a licensed esthetician in 2022, moving into medical aesthetics. My time in aesthetics gave me valuable experience in patient care and building strong relationships, which I bring to my work as a medical assistant. Prior to this role, I worked at a med spa in New Jersey, where I developed my skills in helping others feel their best.
When I’m not at work, I love exploring coffee shops, plant nurseries, concerts, and antiquing. I also make self-care a priority, like going to the gym while listening to music, reading thrillers, or spending time outdoors, whether hiking trails or relaxing at the beach. I’m excited to provide compassionate care and help create a welcoming, supportive environment for every patient at Coastal.
Frannie McPhie
Medical Assistant, Reception and Billing
Hello, my name is Frannie … I graduated from the Harris School of Business as a medical assistant in 2017, and I studied phlebotomy at Delaware Technical Community College. Ive worked in many areas including pediatrics, pain management, acute care and primary care. In total, Ive dedicated assisting professionals for 13 years.
At Coastal, I primarily handle Billing, however you may also see me at the front desk or assisting as a medical assistant (MA) on the primary or walk-in.
What I like about working at Coastal Medical is the diversity. There is always something new every day. The staff is also very positive and supportive and the environment is healthy and friendly.
Outside of work, I enjoy being outdoors, country music dancing with my grandkids, and doing arts and crafts. I’m a true southern bell.
Kimberly
Tipton
RN Nurse Injector
a seasoned registered nurse with a diverse background in Emergency Room Nursing and Case Management. I am a passionate and skilled nurse injector with certifications in SANE, advanced neurotoxins, dermal fillers, and microneedling.
I have a strong commitment to ongoing education, having completed advanced training at prestigious institutions such as the Institute for Laser Medicine and Adora Academy.
At Coastal Medical Center, I am dedicated to helping patients look and feel their best. I have gained a wealth of knowledge and expertise to a comprehensive range of aesthetic services, including IV hydration, dermal fillers, neurotoxins (Botox, Dysport, Jeaveau, Xeomin, and Daxxify), and microneedling.
When not caring for patients, I enjoy spending time with my family, riding horses with my daughter, traveling, and relaxing on the beach.
Support Staff and Reception
Amy Diem
Office Manager
I’m Amy. Although I grew up in Delaware, I’ve had the chance to live in different parts of the country. I’ve always had a passion for helping others, which led me to pursue a degree in education from Lee University in Tennessee. I continued my studies there, earning an add-on degree in special education, and later completed my master’s degree in English as a Second Language from Salisbury University. While I’m an educator by trade, I’ve also worked in various roles within the community, all focused on supporting people.
At Coastal Medical Center, I’m committed to helping our incredible staff by providing them with the support they need and fostering a positive environment that encourages them to thrive. I truly believe the Coastal team is amazing, and they make my job a joy every day.
When I am not at the office, I enjoy the beach and spending time with my family and friends.
Tiffany Gardner
Office Manager
A dedicated Clinical Medical Office Manager with over 11 years of experience optimizing clinic operations, staff management, and patient care workflows. Proven expertise in EHR administration, revenue cycle management, and ensuring regulatory compliance (HIPAA/OSHA). Committed to improving patient satisfaction and fostering a collaborative, efficient team environment. With a background as a Certified Medical Assistant, I strive to create an organized and welcoming environment for both staff and patients. I am passionate about utilizing technology to streamline scheduling and billing, allowing our providers to focus on what matters most—our patients.
Alyssa Diem
Data Entry
I’m Alyssa Diem. I was born and raised in Camden, Delaware! I’m currently in college studying Business and playing volleyball. At work, I handle data entry and help keep my mom, Amy, organized.
Outside of work, you’ll usually find me staying active, hanging out with friends, or enjoying time at the beach.
Desi Allen
Referral and Prior Authorization Coordinator
I’m Desi, and while I primarily handle referrals and prior authorizations, you may also see me at the front desk or assisting as a medical assistant (MA) when needed..
I graduated from the Harris School of Business as a medical assistant and have been in the medical field for 14 years, starting in home health as a teenager. Before joining the team here, I worked at Camden Medical Center since 2015 and also spent time with Bayhealth.
What I love most about working at the clinic is the incredible staff and patients we care for every day. The positive and supportive environment that Ronnie and Amy have created makes it a great place to work, and I really appreciate how we come together as a team to get things done.
Outside of work, I enjoy being outdoors in nature and expressing myself through art. I’m also a true Maryland girl—I love crabs, and they’re my favorite food! My kids are my world and my “why”—I couldn’t imagine life without them.
Michelle Caswell
Referral and Prior Authorization Coordinator
I have been in the medical field as a certified clinical medical assistant (CCMA) since 2011.
During my career in the medical field, I have had the privilege of working in cardiology, general surgery, and primary care. I have enjoyed working one-on-one with patients, providing them with the care and compassion they deserve. I am pleased to now coordinate referrals for patients to healthcare services/specialists for continued care. I also work to obtain approval from insurance companies for medications and medical services needed for treatment.
When not working, I love spending time with my husband of 33 years and our four children. My hobbies include reading and cultivating plants.
Makayla Wright
Receptionist
My name is Makayla a front desk receptionist at Coastal, where I enjoy supporting both patients and the office team. A Delaware native, I graduated from Polytech with a diploma in Healthcare & Rehabilitation and hold a BLS certification. With three years of experience in the medical field, I chose patient care because i genuinely love helping others and learning new skills within the office. In my free time I enjoy traveling and spending quality time with my family.
Mandi Klinger
Receptionist/Medical Assistant
I’m Mandi! Born in CO, raised here in DE. I’ve been a MA since 2019, graduating from Harris School of Business at the top of my class. Prior to being a MA-I was no stranger to the medical field being a SCPhT for nearly a decade in retail pharmacy. I have always had passion for people- and for that I am a very strong pt advocate! I love to LOVE and I strongly believe a smile and some bubbles can set a tone… So that is what you will get from me, whether I want to or not (because, let’s be honest you don’t always want to) I’ll be there greeting you with bubbliness, smiles, love, compassion and kindness.
In free time-Hubby and I have 4 kids from teen to toddler, plus pets. We stay on the go! We love to explore new places and food, obsessed with nature and nerdy/quirky/random things! I love to read and my ‘for me’ is paintball. Formerly on a WNXL team and a local team playing scenario/woodsball/speedball for about 7 years prior to having my last child-that love has taken a back seat, but know my gear bag is ready for whenever I am!
We keep God at the forefront of our hearts and at the foundation of our lives! I hope you will find his light through my vessel here at Coastal Medical.
Jena Caswell
Receptionist / Referrals / Medical Assistant
My name is Jena and I have lived in Delaware my entire life. I am committed to helping the members of my community. I bring a wealth of experience to Coastal as I have been working in the medical field for the past five years. I started my career as a CNA at an assisted living facility. I soon transitioned to the role of Medical Assistant at an OBGYN and Primary care office. Eventually I took on the role of receptionist at 2 separate primary care offices. I am very excited to now be a part of the Coastal team! In my free time, I’m a dog and cat mom and I love to read and spend time with friends and my fiance.
Thera LeBeau
Receptionist
As a Front Desk Receptionist at Coastal, I bring 15 years of extensive experience in the medical field. My career began in Physical Therapy, where I advanced to the role of Office Manager. Following that, I took on the position of Account Specialist for Outpatient Therapy Services at Bayhealth, and later, I worked as a Tech at Delmarva Acupuncture. Throughout my professional journey, I have consistently embraced the principle: “Every person has a story that you do not know; always show kindness, as that story may not be so great.”
Being born and raised in Delaware, I value spending quality time with my family, which includes my incredible husband, son, daughter-in-law, and daughter. My granddaughter has a special way of capturing the spotlight whenever she’s around! Additionally, my furry companions—Marlow and Daisy, my dogs, and Mama, my cat—are cherished members of my household.
I am truly thankful for the steadfast love and support of my husband, Kyle, who has played a pivotal role in shaping the confident individual I am today.
Haley McCullum
Receptionist
I’m the friendly face at the front desk, and I love connecting with patients and helping things run as smoothly as possible (or at least keeping the chaos under control). I also help out with triaging patients from time to time and have 2 years of experience as a medical assistant. I’m always happy to help, answer questions, and solve problems—big or small. Originally from Felton, Delaware, I now live in Maryland, where I spend my time with my husband and my chickens… who definitely keep me on my toes.