1. Home
  2. Directory
  3. California
  4. San Gabriel
  5. Internal Medicine
  6. NPI Profile

DR. MICHAEL MA MD
NPI 1891945804
Internal Medicine in San Gabriel, CA

Active since September 26, 2008PECOS EnrolledAccepts Medicare Assignment
933 WALNUT ST, SAN GABRIEL, CA 91776(626) 372-5922 Get Directions Write a Review

NPPES record last updated: November 30, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Michael Ma Md NPPES

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

DR. MICHAEL MA MD (NPI 1891945804) is an individual internal medicine provider in San Gabriel, California, licensed in California (A107326) and active in the NPI registry since September 2008. He is enrolled in Medicare PECOS and is a graduate of Other (2006).

NPPES Registry Identity

NPI1891945804
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. MICHAEL MACredential: MD
Location Address933 WALNUT STSan Gabriel, CA 91776-2836
Mailing Address933 Walnut StSan Gabriel, CA 91776-2836 · (626) 372-5922
Phone(626) 372-5922
Sole ProprietorNo
Medical School CMSOtherGraduated 2006
Enumeration DateSeptember 26, 2008
Last NPPES UpdateNovember 30, 2021
✔ NPI 1891945804 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A107326
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · Hospice and Palliative MedicineTaxonomy 207RH0002X · License A107326 (CA)
933 WALNUT ST, San Gabriel, CA 91776
Open in Google Maps ↗

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

Dr. Michael Ma 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 ID4880729847
PECOS Enrollment IDI20100316000229
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.

Medicare Billing Reassignment

Medicare enrollment records show Michael Ma reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
1.7 mi
Health Maintenance Organization
3600 ROSEMEAD BLVD
Rosemead, CA 91770
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1396287082 (California)
  • 13,921 clinicians in this Medicare group
NPI 1942787114 (877) 608-0044

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 91776 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

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 Michael Ma's NPI number?

The NPI number for Michael Ma is 1891945804. It was assigned to this individual provider in the NPPES registry on September 26, 2008.

Where is Michael Ma located?

Michael Ma practices at 933 Walnut St, San Gabriel, CA 91776. The listed phone number is (626) 372-5922.

What is Michael Ma's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Michael Ma enrolled in Medicare?

Yes. Michael Ma 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 Michael Ma's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Ma reassigns Medicare benefits to Southern California Permanente Medical Group (Rosemead, CA). 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 Michael Ma's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Michael Ma was last updated on November 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.