John Robyn V. Diez, MD
Addiction Medicine (Internal Medicine) Physician · Oakland, MD
John Robyn V. Diez, MD is an addiction medicine (internal medicine) physician with a practice address in Oakland, Maryland, and NPI 1942881909, issued on Apr 20, 2021. Check the license (Maryland D0102636, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- John Robyn V. Diez
- Credential
- MD
- Primary taxonomy
- Addiction Medicine (Internal Medicine) Physician 207RA0401X
- License number
- D0102636 MD
Self-reported in NPPES; status is on the state search - Practice location
- 69 Wolf Acres Dr, Oakland, MD 21550
- Phone
- (301) 533-2190
- Enumerated
- Apr 20, 2021
- Record last updated
- Aug 25, 2025
- Medicare enrollment
- Enrolled (PECOS I20250404000628); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest addiction medicine (internal medicine) physician records → All 15 in Maryland → Look up another NPI →
Also registered at 69 Wolf Acres Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Heather BosleyClinical Social Worker1114798402
- Sara Cockerham, LCSW-CClinical Social Worker1457900052
- Brianna Graham, LMSWSocial Worker1801722723
- Paul Miller, D.O.Family Medicine Physician1194727487
- Angela Sisler, LCSW-CClinical Social Worker1972133882
Verify John Robyn V. Diez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0102636Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average addiction medicine (internal medicine) physician in 2024
82 Medicare Part D claims, against an average of 829 among the 401 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Buprenorphine-Naloxone39 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
- Specialty Physicians OF Garrett County, LLCOakland, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Robyn V. Diez among 15 addiction medicine (internal medicine) physician records in Maryland
John Robyn V. Diez, MD is one of 15 addiction medicine (internal medicine) physician records with a practice address in Maryland. 60% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 93% of them.
- NPI issued2021 · 93% of these records are older, 0% newer
- In a Medicare fileYes · 60% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Record last updated2025 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RA0401X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Addiction Medicine (Internal Medicine) Physician providers in Maryland
There are 15 addiction medicine (internal medicine) physician records in Maryland.
All 15 in Maryland → Every provider in Oakland → Addiction Medicine (Internal Medicine) Physician nationwide →
The 8 addiction medicine (internal medicine) physician records with the nearest ZIP codes
- Bradley Levin, M.D.Easton, MD 216011629071360
- Arthur Marsh, M.D.Salisbury, MD 218011437297512
- Michael Rose, MD, MPHBaltimore, MD 212871205399730
- Alia Bodnar, M.D.Baltimore, MD 212241043535123
- Megan Buresh, M.D.Baltimore, MD 212241710257290
- Lia PennBaltimore, MD 212241376162768
- Jessica Ratner, MDBaltimore, MD 212241255793675
- Aditi RingwalaBaltimore, MD 212231376801654
Common questions
What is John Robyn V. Diez, MD's NPI number?
John Robyn V. Diez, MD's National Provider Identifier (NPI) is 1942881909, issued on Apr 20, 2021. An NPI identifies a provider in billing; it is not a license.
Where is John Robyn V. Diez, MD located?
The NPPES record lists a practice address at 69 Wolf Acres Dr, Oakland, MD, 21550. Phone: (301) 533-2190. Providers update this record themselves, so call before visiting.
How can I verify John Robyn V. Diez, MD's license?
NPPES lists Maryland license number D0102636, 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 John Robyn V. Diez, MD prescribe under Medicare Part D?
In 2024, John Robyn V. Diez, MD had 82 Medicare Part D claims; the average among addiction medicine (internal medicine) physician prescribers was 829. 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.