NPPES file of Aug 9, 2026

Mark Charles O'Brien

Certified Registered Nurse Anesthetist · Lewiston, ME

Mark Charles O'Brien is a certified registered nurse anesthetist with a practice address in Lewiston, Maine, and NPI 1174243976, issued on Aug 31, 2022. Check the license (Maine RNA253086, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1174243976
Name
Mark Charles O'Brien
Primary taxonomy
Certified Registered Nurse Anesthetist 367500000X
License number
RNA253086 ME
Self-reported in NPPES; status is on the state search
Practice location
300 Main St, Lewiston, ME 04240
Phone
(207) 795-0111
Enumerated
Aug 31, 2022
Record last updated
Oct 29, 2025
Medicare enrollment
Enrolled (PECOS I20260113003563); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest certified registered nurse anesthetist records → All 534 in Maine → Look up another NPI →

Also registered at 300 Main St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Christopher Abbott, D.O.Hospitalist Physician1982043329
  2. Maya Ahluwalia Hackett, DPTPhysical Therapist1700492865
  3. Donald Albee, CRNACertified Registered Nurse Anesthetist1437168903
  4. Joseph Anderson, DOPediatrics Physician1962853697
  5. Nicole Anderson, SLPSpeech-Language Pathologist1548644636
  6. Michelle AndrewsPhysical Therapist1326423237

Verify Mark Charles O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Maine board licenses this profession
    Search for license RNA253086    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Maine license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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One hospital affiliation

  1. Central Maine Medical CenterLewiston, ME · Acute Care Hospitals4 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Mark Charles O'Brien among 534 certified registered nurse anesthetist records in Maine

Mark Charles O'Brien is one of 534 certified registered nurse anesthetist records with a practice address in Maine. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 88% of them.

  • NPI issued2022 · 88% of these records are older, 7% newer
  • In a Medicare fileYes · 76% of these records are
  • In the CMS Doctors and Clinicians fileYes · 74% of these records are
  • Graduated2025 · median 2014 among the 395 with a school on file
  • Record last updated2025 · 57% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 367500000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

61 certified registered nurse anesthetist records list a practice address in Lewiston

They are 61 of the 1,728 NPPES records with a practice address in Lewiston, and 534 certified registered nurse anesthetist records in Maine.

All 534 in Maine → Every provider in Lewiston → Certified Registered Nurse Anesthetist nationwide →

The 8 certified registered nurse anesthetist records with the nearest ZIP codes

  1. Donald Albee, CRNALewiston, ME 042401437168903
  2. Thomas Baiocchi, CRNALewiston, ME 042401225047798
  3. Steven Bender, CRNALewiston, ME 042401851348023
  4. Debra Buege, CRNALewiston, ME 042401255360251
  5. Sherry Decker, CRNALewiston, ME 042401225058688
  6. Patricia Grove, RNLewiston, ME 042401073599718
  7. Debra Koch, CRNALewiston, ME 042401750301370
  8. Elizabeth Lonsdale, CRNALewiston, ME 042401043222441

Common questions

What is Mark Charles O'Brien's NPI number?

Mark Charles O'Brien's National Provider Identifier (NPI) is 1174243976, issued on Aug 31, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Mark Charles O'Brien located?

The NPPES record lists a practice address at 300 Main St, Lewiston, ME, 04240. Phone: (207) 795-0111. Providers update this record themselves, so call before visiting.

How can I verify Mark Charles O'Brien's license?

NPPES lists Maine license number RNA253086, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.