Mark Charles O'Brien

Primary specialty

Certified Registered Nurse AnesthetistTaxonomy code 367500000X

License

RNA253086 Issued in ME

Practice address

300 Main St
Lewiston, ME 04240-7041

Phone

(207) 795-0111

NPI assigned

Aug 31, 2022

Last updated

Oct 29, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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 ME

Enrollment records 1

Specialty

Certified Registered Nurse Anesthetist (Crna)

Education

Other, 2025

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Central Maine Medical CenterGroup PAC ID 2567379563, 344 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Central Maine Medical Center Hospital, Lewiston, ME, CCN 200024

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://fhir-myrecord.cerner.com/r4/4517c430-03bf-4e32-b324-1387cc4e73f3/

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

• Central Maine Medical Center

  • General Acute Care Hospital
  • Lewiston, ME
  • NPI 1689653487
  Medicare reassignment Care Compare group
• Bridgton Hospital

  • Critical Access Hospital
  • Bridgton, ME
  • NPI 1154370153
  Medicare reassignment NPD
• Rumford Hospital

  • Critical Access Hospital
  • Rumford, ME
  • NPI 1205991122
  Medicare reassignment NPD
• Bridgton Hospital

  dba Bridgton Hospital Swing Bed

  • Medicare Defined Swing Bed Hospital Unit
  • Bridgton, ME
  • NPI 1477691467
  NPD
• Central Maine Medical Center

  dba CMMC Specialty Pharmacy

  • Community/Retail Pharmacy
  • Lewiston, ME
  • NPI 1033874458
  NPD
• Central Maine Medical Center

  dba Manchester Care Center

  • Multi-Specialty Clinic/Center
  • Manchester, ME
  • NPI 1598411175
  NPD
• Rumford Hospital

  dba Rumford Hospital Swingbed

  • Medicare Defined Swing Bed Hospital Unit
  • Rumford, ME
  • NPI 1982742482
  NPD

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

• Central Maine Medical Center

  • General Acute Care Hospital
  • Lewiston, ME
  • NPI 1689653487
  Care Compare affiliation

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

{
    "created_epoch": "1661904000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761696000000",
    "number": "1174243976",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "121 WHITNEY RD",
            "city": "GRAY",
            "state": "ME",
            "postal_code": "040397507",
            "telephone_number": "207-653-3036"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "300 MAIN ST",
            "city": "LEWISTON",
            "state": "ME",
            "postal_code": "042407041",
            "telephone_number": "207-795-0111"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "MARK",
        "middle_name": "CHARLES",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2022-08-31",
        "last_updated": "2025-10-29",
        "certification_date": "2025-10-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "367500000X",
            "taxonomy_group": "",
            "desc": "Nurse Anesthetist, Certified Registered",
            "state": "ME",
            "license": "RNA253086",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Dennis Raymond Novak, M.D.
• NR Maine LLC
• NR Maine, LLC
• Amy Nussinow, SLP
• Christine Nwoke, DO
• Bruce O'Donnell, CRNA
• Lindsey Shamburger O'Donnell, PMHNP
• Marsha C O'Rourke, M.D.
• Oasis Residential Care
• Emily M Obie, MOT, OTR/L

• Certified Registered Nurse Anesthetist in Lewiston, ME
• Providers in Lewiston, ME by specialty
• Certified Registered Nurse Anesthetist in Maine

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 29, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• 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.