MR. JOHN ROBYN V DIEZ MD
NPI 1942881909
Internal Medicine - Addiction Medicine in Oakland, MD
About Mr. John Robyn V Diez Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. JOHN ROBYN V DIEZ MD (NPI 1942881909) is an individual addiction medicine provider in Oakland, Maryland, licensed in Maryland (D0102636) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mr. John Robyn V Diez Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show John Robyn Diez reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oakland, MD 21550
- Reassigned Medicare billing, Maryland enrollment
- 120 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21550 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Robyn Diez's NPI number?
The NPI number for John Robyn Diez is 1942881909. It was assigned to this individual provider in the NPPES registry on April 20, 2021.
Where is John Robyn Diez located?
John Robyn Diez practices at 69 Wolf Acres Dr, Oakland, MD 21550. The listed phone number is (301) 533-2190.
What is John Robyn Diez's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Addiction Medicine, with taxonomy code 207RA0401X.
Is John Robyn Diez enrolled in Medicare?
Yes. John Robyn Diez is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for John Robyn Diez's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Robyn Diez reassigns Medicare benefits to Specialty Physicians Of Garrett County, LLC (Oakland, MD). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Robyn Diez's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Robyn Diez accept?
Health plans from CareSource and Highmark Blue Cross Blue Shield West Virginia list John Robyn Diez as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for John Robyn Diez was last updated on September 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mr. John Robyn V Diez, MD · NPI 1942881909
Addiction Medicine physician in Oakland, Maryland. Individual provider, active in the CMS NPPES registry since April 20, 2021.
## Identity
- **NPI:** 1942881909 (Entity type: Individual)
- **Enumerated:** April 20, 2021
- **Primary specialty:** Internal Medicine - Addiction Medicine · taxonomy 207RA0401X
- **State license:** D0102636 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 69 WOLF ACRES DR, Oakland, MD 21550-2046
- **Phone:** (301) 533-2190
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Specialty Physicians Of Garrett County, LLC (NPI 1871065813, Oakland, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** September 21, 2026
- **Other identifiers:** Medicaid 211777100 (MD); Medicaid 1942881909 (WV)
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Source: [NPI Profile](https://npiprofile.com/npi/1942881909) · Data from the CMS NPPES public registry.