DR. JOHN W ROARK JR. MD
NPI 1609834266
Internal Medicine - Gastroenterology in Oakland, CA

Q: What is John Roark's NPI number?

The NPI number for John Roark is 1609834266. It was assigned to this individual provider in the NPPES registry on May 3, 2006.

Q: What is John Roark's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for John Roark was last updated on February 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.

Active since May 03, 2006

91.04/100

CMS Quality Rating

3741 LINWOOD AVE, OAKLAND, CA 94602(510) 589-8774 Get Directions Write a Review

NPPES record last updated: February 10, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. John W Roark Jr. Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JOHN W ROARK JR. MD (NPI 1609834266) is an individual gastroenterology provider in Oakland, California, licensed in California (G038581) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1609834266

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. JOHN W ROARK JR.Credential: MD

Location Address3741 LINWOOD AVEOakland, CA 94602-1711

Mailing Address3741 Linwood AveOakland, CA 94602-1711 · (510) 589-8774

Phone(510) 589-8774

Sole ProprietorNo

Enumeration DateMay 3, 2006

Last NPPES UpdateFebruary 10, 2026

NPPES CertifiedFebruary 10, 2026

✔ NPI 1609834266 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in CA · G038581

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

3741 LINWOOD AVE, Oakland, CA 94602

Open in Google Maps ↗

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

91.04/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

82.13

Promoting Interoperability

100

Improvement Activities

Cost

64.1

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 Roark's NPI number?

The NPI number for John Roark is 1609834266. It was assigned to this individual provider in the NPPES registry on May 3, 2006.

Where is John Roark located?

John Roark practices at 3741 Linwood Ave, Oakland, CA 94602. The listed phone number is (510) 589-8774.

What is John Roark's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

When was this NPI record last updated?

The NPPES record for John Roark was last updated on February 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.