Michael O'Brien, M.D.
NPI 1215257100 · Internal Medicine Physician · King of Prussia, PA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael O'Brien, M.D. is a Internal Medicine Physician provider in King of Prussia, PA (NPI 1215257100).
Provider details
- NPI number
- 1215257100
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 60273132 (NY)
Specialties & taxonomies
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
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 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 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 132 | 28 |
| Gabapentin | 64 | 20 |
| Amlodipine Besylate | 46 | 12 |
| Mirtazapine | 38 | — |
| Tamsulosin Hcl | 37 | — |
| Hydrochlorothiazide | 36 | — |
| Sertraline Hcl | 35 |
Practice location
Mailing address
Additional practice locations (2)
- 4 Jackson StBeacon, NY 12508-3453Phone: (845) 883-8633
- 4808 Edgmont AveBrookhaven, PA 19015-1400Phone: (610) 876-3072
Registry dates
- Enumerated
- 2010-06-02
- Last updated
- 2024-06-12
- Certified
- 2024-06-12
Frequently asked questions
- What is Michael O'Brien's NPI number?
- Michael O'Brien's National Provider Identifier (NPI) is 1215257100, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael O'Brien's specialty?
- Michael O'Brien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael O'Brien located?
- Michael O'Brien's practice location on file with NPPES is 170 N Henderson Rd Ste 310, King of Prussia, PA 19406-2155.
- What is Michael O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Michael O'Brien is (610) 801-1805.
- Does Michael O'Brien accept Medicare?
- Michael 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 Michael O'Brien's NPI active?
- Yes — Michael O'Brien's NPI (1215257100) is active in the NPPES registry as of the last update on 2024-06-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.