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MR. JOHN ROBYN V DIEZ MD
NPI 1942881909
Internal Medicine - Addiction Medicine in Oakland, MD

Active since April 20, 2021PECOS EnrolledAccepts Medicare Assignment
69 WOLF ACRES DR, OAKLAND, MD 21550(301) 533-2190 Get Directions Write a Review

NPPES record last updated: August 25, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jun 2, 2025, Apr 20, 2021 (2 updates tracked since 2021).

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

NPI1942881909
Entity TypeIndividualMale
Primary Taxonomy207RA0401X
Provider Legal NameMR. JOHN ROBYN V DIEZCredential: MD
Location Address69 WOLF ACRES DROakland, MD 21550-2046
Mailing Address69 Wolf Acres DrOakland, MD 21550-2046 · (301) 533-2190
Phone(301) 533-2190
Sole ProprietorNo
Medical School CMSOtherGraduated 2014
Enumeration DateApril 20, 2021
Last NPPES UpdateAugust 25, 20252 updates tracked since enumeration
NPPES CertifiedAugust 25, 2025
✔ NPI 1942881909 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Addiction MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RA0401X
License✔ Licensed in MD · D0102636
Definition
An internist doctor of osteopathy that specializes in the treatment of addiction disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Added Qualifications in the field of Addiction Medicine.
69 WOLF ACRES DR, Oakland, MD 21550
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource, Highmark Blue Cross Blue Shield West Virginia.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID4284158882
PECOS Enrollment IDI20250404000628
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

New Patient
$133.05 typical visit price
range $57.99 – $175.57
Typical copayment $33.26 (range $14.49 – $43.89)
Most-billed visit code 99204
Established Patient
$102.11 typical visit price
range $18.66 – $143.02
Typical copayment $25.52 (range $4.66 – $35.75)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

HEATHER MACHELLE BOSLEY
Social Worker (Clinical)
69 WOLF ACRES DR
OAKLAND, MD 21550
Garrett County (301) 533-2190
DR. PAUL DANIEL MILLER D.O.
Family Medicine
69 WOLF ACRES DR
OAKLAND, MD 21550
Garrett County (301) 334-4400
MISS SARA MICHELLE COCKERHAM LCSW-C
Social Worker (Clinical)
69 WOLF ACRES DR
OAKLAND, MD 21550
Garrett County (301) 533-2190
P DANIEL MILLER D.O., P.A.
Clinic/Center (Health Service)
69 WOLF ACRES DR
OAKLAND, MD 21550
Garrett County (301) 334-4400
BRIANNA GRAHAM LMSW
Social Worker
69 WOLF ACRES DR
OAKLAND, MD 21550
Garrett County (301) 533-2190
ANGELA SISLER LCSW-C
Social Worker (Clinical)
69 WOLF ACRES DR
OAKLAND, MD 21550
Garrett County (301) 533-2190

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.

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 August 25, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.