Patrick O'Brien, M.D.
Emergency Medicine Physician · Knoxville, TN
Patrick O'Brien, M.D. is an emergency medicine physician with a practice address in Knoxville, Tennessee, and NPI 1528095338, issued on Jun 27, 2006. Check the license (Tennessee MD18573, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Patrick O'Brien
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- MD18573 TN
Self-reported in NPPES; status is on the state search - Practice location
- 1924 Alcoa Hwy, Knoxville, TN 37920
- Phone
- (865) 544-9000
- Enumerated
- Jun 27, 2006
- Record last updated
- Nov 15, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (865) 539-8008
- Medicaid IDs
- 3849900 TN
64315849 KY - Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,174 in Tennessee → Look up another NPI →
Also registered at 1924 Alcoa Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rochelle Aaser, APRNCritical Care Medicine Nurse Practitioner1306067921
- Wala Abusalah, MDNephrology Physician1578034161
- Bethany Adams, PTAPhysical Therapy Assistant1639891229
- David Adams, M.DAnesthesiology Physician1043211782
- Lally Adams, M.D.Anesthesiology Physician1093962003
- Anna AddisonStudent in an Organized Health Care Education/Training Program1053233346
Verify Patrick O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license MD18573Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average emergency medicine physician in 2024
123 Medicare Part D claims, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium11 claims
- Bupropion Hcl Sr11 claims
- Escitalopram Oxalate11 claims
- Furosemide11 claims
- Metformin Hcl Er11 claims
- Niacin Er11 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.
Patrick O'Brien among 1,174 emergency medicine physician records in Tennessee
Patrick O'Brien, M.D. is one of 1,174 emergency medicine physician records with a practice address in Tennessee. 83% 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, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2007 · 57% 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 Tennessee 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 Tennessee
There are 1,174 emergency medicine physician records in Tennessee.
All 1,174 in Tennessee → Every provider in Knoxville → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ralph Brooks, M.D.Knoxville, TN 379201891720736
- Roger Brooksbank, M.D.Knoxville, TN 379201932134889
- Matthew Frederick, D.O.Knoxville, TN 379201144404526
- Erik Geibig, M.D.Knoxville, TN 379201578626065
- Douglas Holland, M.D.Knoxville, TN 379201184787855
- Gary Hurt, M.D.Knoxville, TN 379201194768085
- David Linn, M.D.Knoxville, TN 379201306871264
- Jonathan Martin, MDKnoxville, TN 379201881672558
Common questions
What is Patrick O'Brien, M.D.'s NPI number?
Patrick O'Brien, M.D.'s National Provider Identifier (NPI) is 1528095338, issued on Jun 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Patrick O'Brien, M.D. located?
The NPPES record lists a practice address at 1924 Alcoa Hwy, Knoxville, TN, 37920. Phone: (865) 544-9000. Providers update this record themselves, so call before visiting.
How can I verify Patrick O'Brien, M.D.'s license?
NPPES lists Tennessee license number MD18573, as entered by the provider. Search the Tennessee Board of Medical Examiners at https://www.tn.gov/health/licensure/me.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Patrick O'Brien, M.D. prescribe under Medicare Part D?
In 2024, Patrick O'Brien, M.D. had 123 Medicare Part D claims; 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.
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.