Cashel O'Brien, DO
NPI 1093275612 · Hospitalist Physician · Portland, ME
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cashel O'Brien, DO is a Hospitalist Physician provider in Portland, ME (NPI 1093275612).
Provider details
- NPI number
- 1093275612
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- DO3386 (ME)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
6 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Metoprolol Succinate | 16 |
| Empagliflozinbrand: Jardiance | 12 |
| Lisinopril | 11 |
| Rosuvastatin Calcium | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (5)
- 1 Medical Center DrBiddeford, ME 04005-9422Phone: (207) 283-7937Fax: (207) 283-7018
- 121 Medical Center Dr Ste 3100Brunswick, ME 04011-2672Phone: (207) 729-7939Fax: (207) 808-7894
- 24 Miles Center WayDamariscotta, ME 04543-4067Phone: (207) 563-4811Fax: (207) 810-2380
- 25 June StSanford, ME 04073-2621Phone: (207) 324-4310Fax: (207) 490-7999
- 96 Campus DrScarborough, ME 04074-7163Phone: (207) 885-9905Fax: (207) 396-5600
Registry dates
- Enumerated
- 2019-03-20
- Last updated
- 2026-03-05
- Certified
- 2026-03-05
Frequently asked questions
- What is Cashel O'Brien's NPI number?
- Cashel O'Brien's National Provider Identifier (NPI) is 1093275612, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cashel O'Brien's specialty?
- Cashel O'Brien is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Cashel O'Brien located?
- Cashel O'Brien's practice location on file with NPPES is 22 Bramhall St, Portland, ME 04102-3134.
- What is Cashel O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Cashel O'Brien is (207) 662-4618.
- Does Cashel O'Brien accept Medicare?
- Cashel O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cashel O'Brien's NPI active?
- Yes — Cashel O'Brien's NPI (1093275612) is active in the NPPES registry as of the last update on 2026-03-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.