Quick answers
- Does Maria A. Gillamac accept Medicare assignment?
- Yes. Medicare's clinician data says Maria A. Gillamac accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Maria A. Gillamac see?
- In 2024, CMS data shows 375 Original Medicare patients and 890 services for Maria A. Gillamac. This counts Original Medicare only and measures volume, not quality.
- What is Maria A. Gillamac's NPI number?
- 1598207110. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Maria A. Gillamac, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 375 |
|---|---|
| Services billed to Medicare | 890 |
| Different services or procedures | 57 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)180 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)164 services
- Urinalysis, manual test (81002)48 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)43 services
- X-ray of chest, 2 views (71046)34 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure74%
- Arthritis52%
- Diabetes31%
- Ischemic heart disease26%
- Chronic kidney disease24%
Practice locations
Addresses where Maria A. Gillamac is enrolled with Medicare (CMS data updated October 2, 2026).
- 15464 Goldenwest StWestminster, CA 92683 (714) 891‑9008
Group practices
Medicare enrollment lists Maria A. Gillamac as a member of this group (CMS data updated October 2, 2026).
- Memorialcare Medical Foundation566 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Westminster
Clinicians with the same Medicare primary specialty in Westminster, CA — not a recommendation.
Other clinicians in Memorialcare Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2016 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1598207110 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians