Quick answers
- Does Catherine A. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Catherine A. Nguyen 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 Catherine A. Nguyen see?
- In 2024, CMS data shows 617 Original Medicare patients and 1,056 services for Catherine A. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Catherine A. Nguyen's NPI number?
- 1336665975. 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 Catherine A. Nguyen, 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 | 617 |
|---|---|
| Services billed to Medicare | 1,056 |
| Different services or procedures | 60 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)398 services
- Automated urinalysis test (81003)100 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)94 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)81 services
- Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen (87635)75 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 pressure69%
- Arthritis51%
- Ischemic heart disease29%
- Anxiety24%
- Osteoporosis24%
Hospitals where Catherine A. Nguyen works
Medicare's Facility Affiliation Data lists Catherine A. Nguyen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
Practice locations
Addresses where Catherine A. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 10; the Medicare profile lists all.
- 1190 Baker St, Suite 105Costa Mesa, CA 92626 (714) 477‑8460
- 15000 Kensington Park Dr, Suite 170Tustin, CA 92782 (714) 477‑8300
- 16205 Sand Canyon Ave, Suite 100Irvine, CA 92618 (949) 557‑0000
- 19582 Beach Blvd, Suite 180Huntington Beach, CA 92648 (714) 477‑8050
- 21115 Newport Coast DrNewport Beach, CA 92657 (949) 557‑0730
Group practices
Medicare enrollment lists Catherine A. Nguyen as a member of this group (CMS data updated October 2, 2026).
- HMTS Inc118 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Costa Mesa
Clinicians with the same Medicare primary specialty in Costa Mesa, CA — not a recommendation.
Other clinicians in HMTS Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336665975 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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