MARY LI MA MD
NPI 1356606263
Obstetrics & Gynecology in La Mesa, CA
About Mary Li Ma Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY LI MA MD (NPI 1356606263) is an individual obstetrics & gynecology provider in La Mesa, California, licensed in California (C187124) and active in the NPI registry since July 2012. She is enrolled in Medicare PECOS, maintains a secondary practice location in San Diego, and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Mary Li 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.
Medicare Billing Reassignments
5Medicare enrollment records show Mary Ma reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Lemon Grove, CA 91945
- Reassigned Medicare billing, California enrollment
- 1,100 clinicians in this Medicare group
La Jolla, CA 92037
- Reassigned Medicare billing, California enrollment
- 278 clinicians in this Medicare group
Greenville, SC 29607
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Obhg California PC
- 711 clinicians in this Medicare group
Rochester, NY 14620
- Reassigned Medicare billing, New York enrollment
- 107 clinicians in this Medicare group
Canandaigua, NY 14424
- Reassigned Medicare billing, New York enrollment
- 347 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 91942 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LA MESA, CA 91942
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 Mary Ma's NPI number?
The NPI number for Mary Ma is 1356606263. It was assigned to this individual provider in the NPPES registry on July 6, 2012.
Where is Mary Ma located?
Mary Ma practices at 5555 Grossmont Center Dr, La Mesa, CA 91942. The listed phone number is (619) 740-6000.
What is Mary Ma's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Mary Ma enrolled in Medicare?
Yes. Mary 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 organizations bill Medicare for Mary Ma's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Ma reassigns Medicare benefits to 5 organizations: Family Health Centers Of San Diego, Inc (Lemon Grove, CA), Scripps Health Inpatient Providers Medical Group Inc. (La Jolla, CA), Obhg California, P.C. (Greenville, SC), Highlands Womens Health (Rochester, NY) and The Frederick Ferris Thompson Hospital (Canandaigua, NY). Each 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 Mary 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 Mary Ma was last updated on June 20, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mary Li Ma, MD · NPI 1356606263
Obstetrics & Gynecology physician in La Mesa, California. Individual provider, active in the CMS NPPES registry since July 6, 2012.
## Identity
- **NPI:** 1356606263 (Entity type: Individual)
- **Enumerated:** July 6, 2012
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** C187124 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 5555 GROSSMONT CENTER DR, La Mesa, CA 91942-3019
- **Phone:** (619) 740-6000
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Family Health Centers Of San Diego, Inc (NPI 1427282466, Lemon Grove, CA); Scripps Health Inpatient Providers Medical Group Inc. (NPI 1699043000, La Jolla, CA); Obhg California, P.C. (NPI 1215258892, Greenville, SC); Highlands Womens Health (NPI 1861836652, Rochester, NY); The Frederick Ferris Thompson Hospital (NPI 1194776351, Canandaigua, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** June 20, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1356606263) · Data from the CMS NPPES public registry.