Erin Sienkiewicz, MD

Primary specialty

Obstetrics & Gynecology PhysicianTaxonomy code 207V00000X

License

260279 Issued in MA

Practice address

131 Ornac Ste 830
Concord, MA 01742-4191

Phone

(978) 371-1396

Fax

(978) 371-8277

NPI assigned

Mar 25, 2014

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Obstetrics/Gynecology

Education

Pennsylvania State University College of Medicine, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

A.F.a. Obstetrics and Gynecology, P.C.Group PAC ID 6406950542, 14 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Emerson Hospital - Hospital, W Concord, MA, CCN 220084

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: sienkiewicz.erin.epho@direct.partners.masshiway.net

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Afa Midwifery, Obstetrics & Gynecology

  • Obstetrics & Gynecology Physician
  • Concord, MA
  • NPI 1598872426
  Medicare reassignment Care Compare group NPD
• Emerson Hospital

  • General Acute Care Hospital
  • Concord, MA
  • NPI 1467587881
  NPD
• Emerson Hospital

  • General Acute Care Hospital
  • Concord, MA
  • NPI 1922103357
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Emerson Hospital

  • General Acute Care Hospital
  • Concord, MA
  • NPI 1922103357
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1395705600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771804800000",
    "number": "1073930392",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "131 ORNAC STE 830",
            "city": "CONCORD",
            "state": "MA",
            "postal_code": "017424191",
            "telephone_number": "617-636-5000",
            "fax_number": "978-371-8277"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "131 ORNAC STE 830",
            "city": "CONCORD",
            "state": "MA",
            "postal_code": "017424191",
            "telephone_number": "978-371-1396",
            "fax_number": "978-371-8277"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIENKIEWICZ",
        "first_name": "ERIN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2014-03-25",
        "last_updated": "2026-02-23",
        "certification_date": "2026-02-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "MA",
            "license": "260279",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Virginia Sherwood, PHD
• Shields Pet-CT at Emerson Hospital LLC
• Patricia A Shinin, DMD
• Sharon Shung
• Kimberly Shurling, OTR/L
• Rachel Siff, LICSW
• Joyce Marie Simko, RN
• Cynthia Simpson, LICSW
• Gaia Sinatra
• Julia Sinnott

• Obstetrics & Gynecology Physician in Concord, MA
• Providers in Concord, MA by specialty
• Obstetrics & Gynecology Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 23, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.