NPPES file of Aug 9, 2026

Paul Blake O'Brien, M.D.

Emergency Medicine Physician · Prince Frederick, MD

Paul Blake O'Brien, M.D. is an emergency medicine physician with a practice address in Prince Frederick, Maryland, and NPI 1821007220, issued on Aug 5, 2006. Check the license (Maryland D0064665, as entered in NPPES) on the Maryland Board of Physicians; 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
1821007220
Name
Paul Blake O'Brien
Credential
M.D.
Primary taxonomy
Emergency Medicine Physician 207P00000X
License number
D0064665 MD
Self-reported in NPPES; status is on the state search
Practice location
100 Hospital RD, Prince Frederick, MD 20678
Phone
(301) 855-1012
Enumerated
Aug 5, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20070905000324); accepts Medicare assignment
Medical or professional school
Creighton University School Of Medicine, 2003
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 emergency medicine physician records → All 1,190 in Maryland → Look up another NPI →

Also registered at 100 Hospital RD

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

  1. Hamid Anhary, MDAnesthesiology Physician1376515320
  2. Thomas Annulis, MDHospitalist Physician1073589503
  3. Christina Athens, P.A.Medical Physician Assistant1457305682
  4. Sharon Baker, P DPharmacist1528360757
  5. Robin Baranowski, R.N., B.S.N.Registered Nurse1689951568
  6. Natasha Bates, RN BSNRegistered Nurse1881040764

Verify Paul Blake O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMaryland Board of Physicians
    Search for license D0064665    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 Maryland license search

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4.6 times the Medicare Part D claims of the average emergency medicine physician in 2024

1,031 Medicare Part D claims for 403 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 83 claims were for opioids.

  1. Paul O'Brien1,031
  2. Specialty average226

Most prescribed

  1. Prednisone222 claims
  2. Cyclobenzaprine Hcl109 claims
  3. Doxycycline Hyclate79 claims
  4. Oxycodone-Acetaminophen74 claims
  5. Ondansetron Hcl62 claims
  6. Albuterol Sulfate Hfa36 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 one group practice

  1. Florida Emergency Physicians Kang And Associates MD LLCOrlando, FL

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

Paul Blake O'Brien among 1,190 emergency medicine physician records in Maryland

Paul Blake O'Brien, M.D. is one of 1,190 emergency medicine physician records with a practice address in Maryland. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.

  • NPI issued2006 · 5% of these records are older, 59% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileYes · 48% of these records are
  • Graduated2003 · median 2010 among the 571 with a school on file
  • Record last updated2007 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Emergency Medicine Physician providers in Maryland

There are 1,190 emergency medicine physician records in Maryland.

All 1,190 in Maryland → Every provider in Prince Frederick → Emergency Medicine Physician nationwide →

The 8 emergency medicine physician records with the nearest ZIP codes

  1. Matthew Christianson, M.D.Prince Frederick, MD 206781215148473
  2. Elizabeth Rempfer, MDPrince Frederick, MD 206781093344954
  3. Chad Smith, D.O.Prince Frederick, MD 206781295084713
  4. William White, M.D.Prince Frederick, MD 206781497700520
  5. Avery Alatis, MDLeonardtown, MD 206501992201438
  6. Michael Buns, M.D.Lanham, MD 207061528234069
  7. Royce Burns, M.D.Lanham, MD 207061558302182
  8. Alexandra Campbell, M.D.Leonardtown, MD 206501467895284

Common questions

What is Paul Blake O'Brien, M.D.'s NPI number?

Paul Blake O'Brien, M.D.'s National Provider Identifier (NPI) is 1821007220, issued on Aug 5, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Paul Blake O'Brien, M.D. located?

The NPPES record lists a practice address at 100 Hospital RD, Prince Frederick, MD, 20678. Phone: (301) 855-1012. Providers update this record themselves, so call before visiting.

How can I verify Paul Blake O'Brien, M.D.'s license?

NPPES lists Maryland license number D0064665, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Paul Blake O'Brien, M.D. prescribe under Medicare Part D?

In 2024, Paul Blake O'Brien, M.D. had 1,031 Medicare Part D claims for 403 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.