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Calvert Women's Center

Barbara K. Estes, MD, FACOG
Michelle D. Johnson, MD, FACOG
Hilary W. Ginter, MD, FACOG
Aparajita Mahata, MD, FACOG
Ranette Marshall, DO, FACOOG
Mitra Nassiraee, MD
Deborah A. Davis, WHNP-BC

Calvert Women's Center

Calvert Women's Center is pleased to welcome the providers, staff and patients of Calvert OB/GYN Associates of Southern Maryland, LLC.

Beginning November 6, 2016, the doctors, nurse practitioner and staff of Calvert OB/GYN have joined Calvert Women's Center. Their office locations and phone numbers have not changed. Dr. Barbara Estes and Dr. Hilary Ginter will continue to see patients in their normal Prince Frederick office (Calvert Medical Office Building Suite 211) and Dr. Michelle Johnson and WHNP Deborah Davis will continue to see patients in Prince Frederick (CMOB Suite 211) and Dunkirk (Dunkirk Medical Center Suite 202). You will still recognize the faces of the front office staff and medical assistants. 

While the practices of Calvert Women's Center and the former Calvert OB/GYN will remain physically separate for a while, the combined offices will be able to offer our patients greater flexibility in scheduling routine care appointments, and the patients of the former Calvert OB/GYN will be able to participate in CPAs electronic patient portal for secure access to medical records, lab results, prescription refills and provider communications.  

If you are a patient of the former Calvert OB/GYN, please be prepared to complete our New Patient Packet at your first appointment after November 6, 2016. We understand that filling out new paperwork when you have been seeing the same doctor for years seems ridiculous. However, we are obligated by HIPAA and other regulations to have new paperwork completed for every new patient, and while you may not be new to your doctor, you will be new to Calvert Women's Center. We apologize for any inconvenience.

Calvert Women’s Center 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.

Calvert Medical Office Building
110 Hospital Road
Suite 203/Suite 211 (former Calvert OB/GYN office) 
Prince Frederick, MD 20678

Dunkirk Medical Center
10845 Town Center Blvd.
Suite 207/Suite 202 (former Calvert OB/GYN office) 
Dunkirk, MD 20754

Solomons Medical Center
14090 H.G. Trueman Road
Suite 2600
Solomons, MD 20688

To reach Drs. Mahata, Marshall and Mitra:
   Phone: 410-414-4740
   Fax: 410-414-4741

To reach Drs. Estes, Ginter, Johnson and WHNP Davis:
   Phone:  410-535-5610
   Fax: 410-535-6836