Katherine Nguyen, M.D.
NPI 1356319875 · Rheumatology Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Nguyen, M.D. is a Rheumatology Physician provider in San Diego, CA (NPI 1356319875).
Provider details
- NPI number
- 1356319875
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- G079343 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
910 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 324 | $136 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 316 | $99 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 61 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 54 | $97 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 51 | $51 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 315 | 91 |
| Methotrexate Sodiumbrand: Methotrexate | 224 | 66 |
| Prednisone | 193 | 53 |
| Leflunomide | 115 | 33 |
| Gabapentin | 60 | 20 |
| Tramadol Hcl | 51 | — |
| Etanerceptbrand: Enbrel Sureclick |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-10
- Last updated
- 2018-06-08
Frequently asked questions
- What is Katherine Nguyen's NPI number?
- Katherine Nguyen's National Provider Identifier (NPI) is 1356319875, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Nguyen's specialty?
- Katherine Nguyen is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Nguyen located?
- Katherine Nguyen's practice location on file with NPPES is 200 W Arbor Dr, San Diego, CA 92103.
- What is Katherine Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Katherine Nguyen is (619) 543-6248.
- Does Katherine Nguyen accept Medicare?
- Katherine Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Nguyen's NPI active?
- Yes — Katherine Nguyen's NPI (1356319875) is active in the NPPES registry as of the last update on 2018-06-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.