DR. GRACE ZAPATA ANG M.D.
NPI 1902990245
Internal Medicine in Napa, CA
About Dr. Grace Zapata Ang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GRACE ZAPATA ANG M.D. (NPI 1902990245) is an individual internal medicine provider in Napa, California, licensed in California (A68373) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1981).
NPPES Registry Identity
Specialties & Licenses
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. Grace Zapata Ang M.d. 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 Reassignment
Medicare enrollment records show Grace Ang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Napa, CA 94558
- Reassigned Medicare billing, California enrollment
- 755 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94558 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.
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 Grace Ang's NPI number?
The NPI number for Grace Ang is 1902990245. It was assigned to this individual provider in the NPPES registry on October 3, 2006.
Where is Grace Ang located?
Grace Ang practices at 2100 Napa Vallejo Hwy., Napa, CA 94558. The listed phone number is (707) 253-5000.
What is Grace Ang's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Grace Ang enrolled in Medicare?
Yes. Grace Ang 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 Grace Ang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Grace Ang reassigns Medicare benefits to Department Of State Hospitals (Napa, 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 Grace Ang'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 Grace Ang was last updated on April 2, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Dr. Grace Zapata Ang, M.D. · NPI 1902990245
Internal Medicine physician in Napa, California. Individual provider, active in the CMS NPPES registry since October 3, 2006.
## Identity
- **NPI:** 1902990245 (Entity type: Individual)
- **Enumerated:** October 3, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A68373 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2100 NAPA VALLEJO HWY., Napa, CA 94558-6293
- **Phone:** (707) 253-5000 · **Fax:** (408) 730-0548
## 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:** Department Of State Hospitals (NPI 1326098161, Napa, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1981
## Record status
- **NPPES last updated:** April 2, 2019
---
Source: [NPI Profile](https://npiprofile.com/npi/1902990245) · Data from the CMS NPPES public registry.