Mary Nganga, NP
NPI 1578920880 · Primary Care Nurse Practitioner · San Mateo, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Nganga, NP is a Primary Care Nurse Practitioner provider in San Mateo, CA (NPI 1578920880).
Provider details
- NPI number
- 1578920880
- Entity type
- Individual
- Primary specialty
- Primary Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 95003460 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,214 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Complex Chronic Care Management Services for Two Or More Chronic Conditions, Each Additional 60 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99489 | 344 | $73 |
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99439 | 165 | $48 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 151 | $114 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 147 | $62 |
| Complex Chronic Care Management Services for Two Or More Chronic Conditions, First 60 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99487 | 114 | $138 |
Practice location
Mailing address
Additional practice locations (2)
- 488 E Santa Clara StArcadia, CA 91006-7229Phone: (626) 588-8713
- 14141 Southwest Fwy Ste 500Sugar Land, TX 77478-3494Phone: (281) 356-0364
Registry dates
- Enumerated
- 2016-01-19
- Last updated
- 2025-11-05
- Certified
- 2025-11-05
Frequently asked questions
- What is Mary Nganga's NPI number?
- Mary Nganga's National Provider Identifier (NPI) is 1578920880, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Nganga's specialty?
- Mary Nganga is listed in the NPPES registry with a primary specialty of Primary Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Nganga located?
- Mary Nganga's practice location on file with NPPES is 1875 S Grant St Ste 760, San Mateo, CA 94402-2670.
- What is Mary Nganga's phone number?
- The practice phone number listed in the NPPES registry for Mary Nganga is (888) 227-8884.
- Does Mary Nganga accept Medicare?
- Mary Nganga is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Nganga's NPI active?
- Yes — Mary Nganga's NPI (1578920880) is active in the NPPES registry as of the last update on 2025-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.