Nathan Michael O'Brien, M.D.
Emergency Medicine Physician · Ocoee, FL
Nathan Michael O'Brien, M.D. is an emergency medicine physician with a practice address in Ocoee, Florida, and NPI 1558628578, issued on Apr 15, 2012. Check the license (Florida ME 127854, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Nathan Michael O'Brien
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- ME 127854 FL
Self-reported in NPPES; status is on the state search - Practice location
- 10000 W Colonial Dr, Ocoee, FL 34761
- Phone
- (407) 296-1000
- Enumerated
- Apr 15, 2012
- Record last updated
- Jun 30, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160829000388); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2012
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 4,034 in Florida → Look up another NPI →
Also registered at 10000 W Colonial Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathan Michael O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME 127854Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average emergency medicine physician in 2024
75 Medicare Part D claims for 57 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen14 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Emergency Physicians OF Central Florida LLPClermont, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Michael O'Brien among 4,034 emergency medicine physician records in Florida
Nathan Michael O'Brien, M.D. is one of 4,034 emergency medicine physician records with a practice address in Florida. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 57% of them.
- NPI issued2012 · 57% of these records are older, 39% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2012 · median 2013 among the 2,199 with a school on file
- Record last updated2016 · 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 207P00000X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 emergency medicine physician records list a practice address in Ocoee
They are 11 of the 1,086 NPPES records with a practice address in Ocoee, and 4,034 emergency medicine physician records in Florida.
All 4,034 in Florida → Every provider in Ocoee → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Kenneth Allwood, MDOcoee, FL 347611659471647
- Suzanne Benjamin, MDOcoee, FL 347611811965577
- James Brown, M.D.Ocoee, FL 347611174962179
- Brian Buning, M.D.Ocoee, FL 347611053794289
- Whitner Davis, M.D.Ocoee, FL 347611114255718
- Richard Houle, MDOcoee, FL 347611023085099
- Maurice Mascoe, MDOcoee, FL 347611396712352
- N Ryan, MDOcoee, FL 347611982794681
Common questions
What is Nathan Michael O'Brien, M.D.'s NPI number?
Nathan Michael O'Brien, M.D.'s National Provider Identifier (NPI) is 1558628578, issued on Apr 15, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Michael O'Brien, M.D. located?
The NPPES record lists a practice address at 10000 W Colonial Dr, Ocoee, FL, 34761. Phone: (407) 296-1000. Providers update this record themselves, so call before visiting.
How can I verify Nathan Michael O'Brien, M.D.'s license?
NPPES lists Florida license number ME 127854, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan Michael O'Brien, M.D. prescribe under Medicare Part D?
In 2024, Nathan Michael O'Brien, M.D. had 75 Medicare Part D claims for 57 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Nathan Michael O'Brien, M.D.'s MIPS final score?
The 2023 MIPS final score is 86.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.
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.