Richard C. Greyson, MD
Internal Medicine Physician · Oklahoma City, OK
Richard C. Greyson, MD is an internal medicine physician with a practice address in Oklahoma City, Oklahoma, and NPI 1356355770, issued on Jul 28, 2006. Check the license (Oklahoma 10537, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- Richard C. Greyson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 10537 OK
Self-reported in NPPES; status is on the state search - Practice location
- 1110 N Classen Blvd, Oklahoma City, OK 73106
- Phone
- (405) 232-2702
- Enumerated
- Jul 28, 2006
- Record last updated
- Jul 1, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (405) 272-0839
- Medicaid ID
- 100111660A OK
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,115 in Oklahoma → Look up another NPI →
Also registered at 1110 N Classen Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Johnston, MDInternal Medicine Physician1144204314
- Maria Kane, M.D.Psychiatry Physician1922050335
- Sally Tan, M.D.Internal Medicine Physician1699887331
Verify Richard C. Greyson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOklahoma Board of Medical Licensure and Supervision
Search for license 10537Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,780 Medicare Part D claims for 187 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 23 claims were for opioids.
Most prescribed
- Atorvastatin Calcium99 claims
- Ezetimibe74 claims
- Hydrochlorothiazide64 claims
- Losartan Potassium63 claims
- Lisinopril62 claims
- Levothyroxine Sodium53 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.
Richard C. Greyson among 1,115 internal medicine physician records in Oklahoma
Richard C. Greyson, MD is one of 1,115 internal medicine physician records with a practice address in Oklahoma. 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 11% of them.
- NPI issued2006 · 11% of these records are older, 57% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2010 · 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 Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
418 internal medicine physician records list a practice address in Oklahoma City
They are 418 of the 22,359 NPPES records with a practice address in Oklahoma City, and 1,115 internal medicine physician records in Oklahoma.
All 1,115 in Oklahoma → Every provider in Oklahoma City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- James Johnston, MDOklahoma City, OK 731061144204314
- Jerry Pritchett, MDOklahoma City, OK 731061811156615
- Sally Tan, M.D.Oklahoma City, OK 731061699887331
- Chase Adams, MD, MSOklahoma City, OK 731041194655910
- Lohithasya Chowdary Chunduru, MDOklahoma City, OK 731041821989054
- Javeria KhanOklahoma City, OK 731041033038211
- Gunjan Kochhar, MDOklahoma City, OK 731041053253773
- Madyson Kuhn, DOOklahoma City, OK 731041972439537
Common questions
What is Richard C. Greyson, MD's NPI number?
Richard C. Greyson, MD's National Provider Identifier (NPI) is 1356355770, issued on Jul 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Richard C. Greyson, MD located?
The NPPES record lists a practice address at 1110 N Classen Blvd, Oklahoma City, OK, 73106. Phone: (405) 232-2702. Providers update this record themselves, so call before visiting.
How can I verify Richard C. Greyson, MD's license?
NPPES lists Oklahoma license number 10537, as entered by the provider. Search the Oklahoma Board of Medical Licensure and Supervision at https://www.okmedicalboard.org/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Richard C. Greyson, MD prescribe under Medicare Part D?
In 2024, Richard C. Greyson, MD had 1,780 Medicare Part D claims for 187 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.