John Nkwachukwu Onyema, M.D.,
Internal Medicine Physician · Las Vegas, NV
John Nkwachukwu Onyema, M.D., is an internal medicine physician with a practice address in Las Vegas, Nevada, and NPI 1801855507, issued on Mar 21, 2006. Check the license (Nevada 7397, as entered in NPPES) on the Nevada State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John Nkwachukwu Onyema
- Credential
- M.D.,
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 7397 NV
Self-reported in NPPES; status is on the state search - Practice location
- 4180 S Rainbow Blvd, Las Vegas, NV 89103
- Phone
- (702) 383-3626
- Enumerated
- Mar 21, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (702) 383-7844
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,229 in Nevada → Look up another NPI →
Also registered at 4180 S Rainbow Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bernard Bartolome, M.D.Internal Medicine Physician1811958341
- Edward Forkos, MDInternal Medicine Physician1932166907
Verify John Nkwachukwu Onyema in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNevada State Board of Medical Examiners
Search for license 7397Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,122 Medicare Part D claims for 219 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 68 claims were for opioids.
Most prescribed
- Atorvastatin Calcium204 claims
- Metformin Hcl89 claims
- Lisinopril86 claims
- Amlodipine Besylate82 claims
- Levothyroxine Sodium72 claims
- Albuterol Sulfate Hfa51 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.
John Nkwachukwu Onyema among 1,229 internal medicine physician records in Nevada
John Nkwachukwu Onyema, M.D., is one of 1,229 internal medicine physician records with a practice address in Nevada. 82% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 43% 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 Nevada practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
716 internal medicine physician records list a practice address in Las Vegas
They are 716 of the 65,269 NPPES records with a practice address in Las Vegas, and 1,229 internal medicine physician records in Nevada.
All 1,229 in Nevada → Every provider in Las Vegas → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Javaid Anwar, M.D.Las Vegas, NV 891031528031978
- Bernard Bartolome, M.D.Las Vegas, NV 891031811958341
- Kathleen Cansler, MDLas Vegas, NV 891031801931761
- Howard Coker, MDLas Vegas, NV 891031386617348
- Edward Forkos, MDLas Vegas, NV 891031932166907
- Lakisha Hawkins, MDLas Vegas, NV 891031477727170
- Daniel Malone, MDLas Vegas, NV 891031538132022
- Mitulkumar Patel, M.D.Las Vegas, NV 891031093701674
Common questions
What is John Nkwachukwu Onyema, M.D.,'s NPI number?
John Nkwachukwu Onyema, M.D.,'s National Provider Identifier (NPI) is 1801855507, issued on Mar 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Nkwachukwu Onyema, M.D., located?
The NPPES record lists a practice address at 4180 S Rainbow Blvd, Las Vegas, NV, 89103. Phone: (702) 383-3626. Providers update this record themselves, so call before visiting.
How can I verify John Nkwachukwu Onyema, M.D.,'s license?
NPPES lists Nevada license number 7397, as entered by the provider. Search the Nevada State Board of Medical Examiners at https://medboard.nv.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Nkwachukwu Onyema, M.D., prescribe under Medicare Part D?
In 2024, John Nkwachukwu Onyema, M.D., had 2,122 Medicare Part D claims for 219 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.
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.