Diane Pham
NPI 1538799820 · Family Nurse Practitioner · Santa Ana, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Pham is a Family Nurse Practitioner provider in Santa Ana, CA (NPI 1538799820).
Provider details
- NPI number
- 1538799820
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- Yes
- License
- 95018390 (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 tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
273 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 112 | $84 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 107 | $118 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 36 | $13 |
| Urinalysis, Manual Test81002 | 18 | $3 |
Typical Medicare-allowed amounts for these services range $3–$118 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 59 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 211 | 125 |
| Rosuvastatin Calcium | 117 | 65 |
| Levothyroxine Sodium | 96 | 68 |
| Losartan Potassium | 95 | 58 |
| Amlodipine Besylate | 93 | 63 |
| Lisinopril | 81 | 45 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$120 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-01-25
- Last updated
- 2023-01-06
- Certified
- 2023-01-06
Frequently asked questions
- What is Diane Pham's NPI number?
- Diane Pham's National Provider Identifier (NPI) is 1538799820, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Pham's specialty?
- Diane Pham is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Diane Pham located?
- Diane Pham's practice location on file with NPPES is 3403 S Main St Unit K, Santa Ana, CA 92707-4325.
- What is Diane Pham's phone number?
- The practice phone number listed in the NPPES registry for Diane Pham is (714) 425-4266.
- Does Diane Pham accept Medicare?
- Diane Pham is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Pham's NPI active?
- Yes — Diane Pham's NPI (1538799820) is active in the NPPES registry as of the last update on 2023-01-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.