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MR. RONALD MAH M.A.
NPI 1821022591
Counselor - Mental Health in San Leandro, CA

Active since July 10, 2006Opted out of Medicare · through Apr 17, 2028
433 ESTUDILLO AVE STE 305, SAN LEANDRO, CA 94577(510) 614-5641(510) 889-6553 Get Directions Write a Review

NPPES record last updated: July 15, 2007. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mr. Ronald Mah M.a. NPPES

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

MR. RONALD MAH M.A. (NPI 1821022591) is an individual mental health provider in San Leandro, California, licensed in California (MFC32136) and active in the NPI registry since July 2006. He has opted out of Medicare through April 17, 2028.

NPPES Registry Identity

NPI1821022591
Entity TypeIndividualMale
Primary Taxonomy101YM0800X
Provider Legal NameMR. RONALD MAHCredential: M.A.
Location Address433 ESTUDILLO AVE STE 305San Leandro, CA 94577-4915
Mailing Address18937 Brickell WayCastro Valley, CA 94546-2411 · (510) 614-5641 · Fax (510) 889-6553
Phone(510) 614-5641
Fax(510) 889-6553
Sole ProprietorYes
Enumeration DateJuly 10, 2006
Last NPPES UpdateJuly 15, 2007
✔ NPI 1821022591 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in CA · MFC32136
433 ESTUDILLO AVE STE 305, San Leandro, CA 94577
Open in Google Maps ↗

Other Identifiers 1

Other8166CA · Acbhcs, Alameda County Be

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Mr. Ronald Mah M.a. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from April 17, 2024 through April 17, 2028.

Opt-Out Effective DateApril 17, 2024
Opt-Out In Effect ThroughApril 17, 2028Opt-out affidavits renew automatically every two years unless cancelled

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JAMES PETROS, M.D., INC.
Physical Medicine & Rehabilitation
433 ESTUDILLO AVE STE 305
SAN LEANDRO, CA 94577
Alameda County (408) 528-8833

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 Ronald Mah's NPI number?

The NPI number for Ronald Mah is 1821022591. It was assigned to this individual provider in the NPPES registry on July 10, 2006.

Where is Ronald Mah located?

Ronald Mah practices at 433 Estudillo Ave Ste 305, San Leandro, CA 94577. The listed phone number is (510) 614-5641.

What is Ronald Mah's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Is Ronald Mah enrolled in Medicare?

No. Ronald Mah has opted out of Medicare through April 17, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

When was this NPI record last updated?

The NPPES record for Ronald Mah was last updated on July 15, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.