NPPES file of Aug 9, 2026

Michael Robert O'Brien, M.D.

Internal Medicine Physician · King Of Prussia, PA

Michael Robert O'Brien, M.D. is an internal medicine physician with a practice address in King Of Prussia, Pennsylvania, and NPI 1215257100, issued on Jun 2, 2010. Check the license (Pennsylvania MD482644, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1215257100
Name
Michael Robert O'Brien
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
MD482644 PA
60273132 NY
Self-reported in NPPES; status is on the state search
Practice location
170 N Henderson RD Ste 310, King Of Prussia, PA 19406
Phone
(610) 801-1805
Enumerated
Jun 2, 2010
Record last updated
Jun 12, 2024
Medicare enrollment
Enrolled (PECOS I20240206000491); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
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 internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →

Also registered at 170 N Henderson RD Ste 310

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

  1. Onikepe Adegbola, MD PHDGeneral Practice Physician1134278849
  2. Christina FretsAssistant Behavior Analyst1801774468
  3. Amit Gangoli, MDInfectious Disease Physician1396732996
  4. Gwendolyn GarnettBehavior Technician1962374736
  5. Matthew Kavalek, MDFamily Medicine Physician1871156398
  6. Wendy Le, DPM, MPHPodiatrist1053751727

Verify Michael Robert O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
    Search for license MD482644    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
Open the Pennsylvania license search

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57% fewer Medicare Part D claims than the average internal medicine physician in 2024

1,368 Medicare Part D claims for 119 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 19 claims were for opioids.

  1. Michael O'Brien1,368
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium132 claims
  2. Gabapentin64 claims
  3. Amlodipine Besylate46 claims
  4. Mirtazapine38 claims
  5. Tamsulosin Hcl37 claims
  6. Hydrochlorothiazide36 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Bills Medicare through 2 group practices

  1. Home Visit Medical PLLCKing Of Prussia, PA
  2. West Coast Wound And Skin Care IncPhoenixville, PA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Michael Robert O'Brien among 7,300 internal medicine physician records in Pennsylvania

Michael Robert O'Brien, M.D. is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 50% of them.

  • NPI issued2010 · 50% of these records are older, 48% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 58% of these records are
  • Graduated2010 · median 2008 among the 4,208 with a school on file
  • Record last updated2024 · 56% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

15 internal medicine physician records list a practice address in King Of Prussia

They are 15 of the 1,391 NPPES records with a practice address in King Of Prussia, and 7,300 internal medicine physician records in Pennsylvania.

All 7,300 in Pennsylvania → Every provider in King Of Prussia → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Frederic Becker, M.DKing Of Prussia, PA 194061194712174
  2. Melissa Cognetti, MDKing Of Prussia, PA 194061518997675
  3. Jayson Dupre, DOKing Of Prussia, PA 194061851500185
  4. Andrew Ecker, MDKing Of Prussia, PA 194061669400818
  5. Bess Koenigsberg, M.D.King Of Prussia, PA 194061992833743
  6. Emma Link, MDKing Of Prussia, PA 194061528649381
  7. Saheed Ojo-Oniyun, M.DKing Of Prussia, PA 194061649333071
  8. Elyse Rosenthal, D.O.King Of Prussia, PA 194061639599293

Common questions

What is Michael Robert O'Brien, M.D.'s NPI number?

Michael Robert O'Brien, M.D.'s National Provider Identifier (NPI) is 1215257100, issued on Jun 2, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Michael Robert O'Brien, M.D. located?

The NPPES record lists a practice address at 170 N Henderson RD Ste 310, King Of Prussia, PA, 19406. Phone: (610) 801-1805. Providers update this record themselves, so call before visiting.

How can I verify Michael Robert O'Brien, M.D.'s license?

NPPES lists Pennsylvania license number MD482644, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Michael Robert O'Brien, M.D. prescribe under Medicare Part D?

In 2024, Michael Robert O'Brien, M.D. had 1,368 Medicare Part D claims for 119 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions 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.