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CalvertHealth Obstetrics & Gynecology

CalvertHealth OB/GYN is dedicated to the health and well-being of women of all ages. We offer the full range of adult and adolescent gynecological care as well as complete obstetric care, including the management of high-risk pregnancies.

Our team of physicians is experienced in treating a wide range of women’s health issues:

Reproductive and Pelvic Health

  • Abnormal uterine bleeding
  • Chronic pelvic pain
  • Endometriosis
  • Fibroids
  • Menopause and perimenopause issues
  • Menstrual disorders
  • Pelvic Organ Prolapse
  • Polycystic ovarian syndrome (PCOS)
  • Premenstrual Syndrome

Breast Cancer Screening

Gynecologic Cancer
Screening and Evaluation

  • Cervical
  • Ovarian
  • Uterine
  • Vaginal
  • Vulvar

Obstetric Health

  • Pregnancy planning
  • Prenatal care
  • Obstetrical ultrasound and screening tests
  • High risk preganancy
  • Management of medical complications of pregnancy
  • Pre-eclampsia and eclampsia
  • Gestational diabetes
  • Vaginal and surgical delivery
  • Management of postpartum issues including hemorrhage and depression


  • Birth control pills
  • IUD insertion and removal
  • Birth control patch
  • Nexplanon insertion and removal


Preventative Care and Well-woman Visits

In addition, our physicians are experienced in advanced gynecological surgery techniques, including open and minimally invasive laparoscopic procedures for hysterectomy, hysteroscopy and endometrial ablation.

Our OB providers are the only physicians with privileges to deliver at the CalvertHealth Center for Family Birth Care.
Prenatal Registration
You may use this online form to register at the CalvertHealth Center For Family Birth Care.

Register Today
Classes & Events
ABC’s of Breast Feeding
Breastfeeding Support Group
Birth Center Tours
Baby Care Basics
Childbirth Education
Infant CPR*
Outpatient Lactation - Call for appt 410-414-5414
Safe Sitter

*Upon completion of this course participants will earn a course completion card. This is not a certification card. If a certification card is required one of the other CPR classes we offer may better meet your needs.

Our Providers

Barbara K. Estes, MD

Dr. Barbara K. Estes went to medical school and did her Internship at George Washington University and completed her Residency at George Washington University Medical Center, finishing in 1997. She came directly to Calvert and opened Calvert OB/GYN Associates of Southern Maryland, eventually being joined by classmate Dr. Michelle Johnson.

They closed Calvert OB/GYN in November, 2016 and joined Calvert Physician Associates’ Calvert Women’s Center, now CalvertHealth OB/GYN. “I know how to run a practice, but I really wanted to focus on patient care. With CalvertHealth OB/GYN, I can turn over the administrative piece and spend my time taking care of my patients. That’s why I went into medicine in the first place.”

Dr. Estes always knew she wanted to be a doctor, but didn’t decide on obstetrics and gynecology until medical school. “I knew I liked taking care of people, especially women, and I liked doing complex and challenging things. OB/GYN was a perfect combination of surgery, and medicine. And I get to deliver babies!”

Dr. Estes and her husband have enjoyed their time here in Calvert. “We chose Calvert because I wanted to go where they needed doctors. In Montgomery County and DC, there are doctors everywhere. In Calvert, there was a real need.

“It doesn’t hurt that it is surrounded by water and is a great place to raise a family. My son is in college now, but he is still friends with the kids he met in kindergarten. To live and practice medicine in Calvert, you have to be comfortable running into people you know, including your patients. I really like people, so I’m ok with that.”

In addition to her busy patient schedule, Dr. Estes is the current Chair of the Obstetrics department at Calvert Memorial Hospital. She completed her MBA from Johns Hopkins in 2010 and has become a key proponent for the Project Lead the Way Biomedical Sciences program, a collaboration between Calvert Memorial Hospital and Calvert Public Schools. The program gives local high school students an opportunity to get hands-on experience working in healthcare, progressing through rotations in biology, general medicine, surgery and obstetrics and gynecology and shadowing doctors and other medical professionals at the hospital. “Our goal is to connect students to real-world experiences and people, giving them a chance to find out about jobs that may be interesting to them.”

Dr. Estes sees both obstetric and gynecologic patients in her office in Prince Frederick. “With my gynecologic patients, we focus on overall wellness and lifestyle – diet and sleep, for example. And I love working with my OB patients. It’s such a happy time, whether it’s the first or the fourth time.”

Hilary Ginter, MD, FACOG

Dr. Hilary Ginter, Obstetrics and Gynecology was a natural choice in med school. Her undergraduate training was in Psycho Biology, the study of the biology of the brain, and, despite being fascinated by science, she realized quickly that her calling was in helping people, not research; that put her down the path to becoming an MD, not a PhD.

After completing her under graduate training at Mount Holyoke College in Massachusetts, she took a couple of years off before starting medical school and spent that time working at a Women’s Health Clinic, providing contraceptive and women’s health education. “That’s really where my interest started. I was a young woman myself and had spent the last years at a women’s college, and was spending time learning about and then educating women about their bodies and their reproductive health. Learning about what our bodies can do was fascinating.”

In medical school, Dr. Ginter thought that OB/GYN might be her preferred specialty, but also toyed with the idea of surgery because of the challenge. Ultimately, she chose OB/GYN because it combined her interest in women’s health and her desire to work on complex surgical cases. “It is the best of both worlds. I can focus on women’s health issues, deliver babies and perform big, complicated surgeries.”

Prior to coming to Calvert, Dr. Ginter worked in a local community hospital as an OB/GYN in western Maryland. When her husband started working Annapolis, Calvert became her location of choice to practice medicine. “A community hospital setting is I have known for my entire career, and it’s what I love. I didn’t want to live or work in a big city, and Calvert felt like home.”

One of the things she likes most about working in OB/GYN and in Calvert is the diversity of the patient population and patient situations. “I love walking into the office and not knowing what or who I’m going to see. A great day for me is seeing a few women’s health patients in the morning, delivering a baby over lunch and doing a surgery in the afternoon. As an OB/GYN, I get to work with young women just beginning to understand their bodies, adult women in the process of creating their own families, and older women who are adjusting to their lives after menopause. You can’t get more diverse than that!”

Michelle Johnson, MD, FACOG

Dr. Michelle Johnson went into medicine for the best possible reason. “I really like helping people.” She chose obstetrics and gynecology because “it is the best of both worlds; I get to deliver babies and be a surgeon. On top of that I really like having women as patients; so being an OB/GYN is perfect for me.”

Dr. Johnson came to Calvert in 2003 after spending six (6) years at Washington Hospital Center. She was a Resident at George Washington University Hospital Center with Dr. Barbara Estes who had already opened Calvert OB/GYN of Southern Maryland. When she approached Dr. Johnson about joining her, Dr. Johnson said yes.

“I Iove being in Calvert! One of the first things I noticed was that the people here are super nice! They were – and are – so different from the patients in DC. I especially love my pregnant patients. They are so happy! It’s just such a joy to work with happy people all day.”

Dr. Johnson also enjoys her gynecologic patients, even though she often only sees them once a year. “If I see them more regularly, that generally means there is a problem and that’s never fun for either of us.”

Like most surgeons, Dr. Johnson has a special love for being in the OR. “I love the challenge, but more importantly, I love knowing that what I am doing in the OR really matters. I mean, if I am called in for a ruptured ectopic pregnancy, I can walk out knowing I literally saved that person’s life. I love anatomy, I love the physical aspects of performing a surgery, and I love the immediate satisfaction that comes from knowing I am helping someone feel better.”

In joining Calvert Women’s Center and Calvert Physician Associates, now CalvertHealth Medical Group (CHMG), CalvertHealth OB/GYN, Dr. Johnson is looking forward to being able to focus entirely on patient care. “I Love my patients and I am love being able to spend the time with them that they deserve. Being part of CHMG means that I can spend less time worrying about the practice and more time practicing medicine.”

Aparajita Mahata, MD, FACOG

Dr. Aparajita Mahata has been a practicing OB/GYN in Calvert County since 1993. After completing her Internship in Internal Medicine at the Brigham and Women’s Hospital in Waltham MA, she moved to Washington DC to do her Residency in OB/GYN at Providence Hospital.

“After my Residency, I was working at Washington Adventist and Laurel Hospital and I came to Calvert to visit some friends. I was enjoying the drive and the countryside so much I got lost and found myself driving by the old Calvert Memorial Hospital. I had no idea there was a hospital here. My friends suggested I check it out, and I’ve been here ever since. That was over 23 years and countless babies ago.

Dr. Mahata specializes in all major and minor gynecologic surgeries as well as high risk pregnancies. “High Risk means any pregnancy where the baby could be affected by complications related to the mother’s health – her age, blood pressure, diabetes or gestational diabetes – these are all conditions that need to be watched and managed carefully to minimize their impact on the baby.“

While Dr. Mahata prides herself on providing the best possible care to her patients, her patients appreciate her nurturing dedication to their well-being. “When I am with a patient, whether it is a first time mom or a women coming in for her annual well-woman exam, I try to treat her the same way that I would like to be treated – with respect, dignity and compassion.”

Dr. Mahata brings broad experience to treating a wide variety of women’s health issues including abnormal uterine bleeding, menopause, osteoporosis, polycystic ovarian syndrome (PCOS), chronic pelvic pain, fibroids, minimally invasive hysteroscopic and laparoscopic GYN surgery and hysteroscopic sterilization. She places a high priority on patient education. “It is very important to me that patients are involved in decisions about their care,” she said. “Their active participation contributes significantly to greater levels of patient satisfaction.”

Dr. Mahata has dedicated herself to enhancing women’s health services in Calvert County. She has served as medical director of the hospital’s Woman’s Wellness program, chaired the obstetrics department and was active on the perinatal collaborative to improve services for women delivering at the CMH Family Birth Center. She is also a member of the American Society for Colposcopy and Cervical Pathology and the Endocrine Society.

Mitra Nassiraee, MD

Dr. Mitra Nassiraee (Dr. Mitra to her patients and staff) came to Calvert County after completing her Residency in Eastern Virginia Medical Center, a tertiary center for high risk pregnancies. She had been looking at a couple of other, much larger hospitals around DC but really wanted to become part of a community and not just another doctor in a big practice. “Calvert just felt like a good place to raise my children.”

For Dr. Mitra, being an OB/GYN is in her blood – literally. Both her mother and father are OB/ GYNs, and she witnessed her first live delivery at the age of 11. “It was magical!”

“I always knew I wanted to be a doctor like my parents, but that I might choose a different specialty. Then, during medical school rotations, I found my passion again in OB/GYN. Nothing else could compare.”

Obstetrics and Gynecology is a very personal specialty. “It’s important to me to have a relationship with my patients. When I am helping a patient make an important medical decision, I try to treat them as if they were a member of my family – my mother, my sister, my daughter. I want them to fully understand what is happening to them, what the options are and what the risks are so that we can together make an educated decision about their healthcare.

“I love starting my patient relationships when they are young – even teenagers. It is a joy to be with them as they have their first child, second child, even grandchildren. ”

From routine gynecological care to pregnancy and menopause, Dr. Nassiraee provides comprehensive health care to women of all ages in Southern Maryland. She cares for women as early as adolescence through the transition to menopausal years and beyond. Her services include general obstetrics, family planning, annual gynecologic exams, contraception and women’s health.

Deborah Davis, WHNP-BC

Deborah Davis has been a nurse for over 30 years and a Women’s Health Nurse Practitioner for over 20 years.  She had originally planned to go into pediatric nursing, but changed her mind during her Women’s Health rotation in nursing school.

“I think that Women’s Health is a very healthy aspect of nursing; I get to do a lot of patient teaching and educating which I really enjoy and the women appreciate. Women typically take care of the entire family, and in doing so they frequently ignore themselves. So I really enjoy the preventative aspect of women’s health.”

She also worked as a fertility nurse before coming to Calvert, and works here with patients in the initial steps of their fertility treatment process. “We can do the early testing here and help to assess fertility issues and, if it’s a simple hormonal problem do some very simple and early drug treatments, but we work with and refer to fertility specialists once we have determined the initial issue.”

Debbie prides herself in creating individualized care plans for her patients. She spends time with her patients to determine the best course of action for their particular issue. “I enjoy getting to know my patients - young or old - and look at them as individuals. When they have an issue I work with them to develop a plan of action that we can both agree on and that will meet their needs for the outcome they are hoping for.

Debbie sees mostly gynecologic patients, but also works with obstetrical patients up until the point that they deliver their baby. “The only thing I can’t do is go into the delivery room with them.” For her gynecologic patients, Debbie provides a full range of services for contraception, reproductive health and the management of menopause and post-menopausal symptoms. “I am still to this day fascinated by this amazing process of reproduction and this amazing machine that is our body. Just think of all the things that have to work right and all the things that have to happen for a baby to be born. I just love it!”