Molly Diaz, PA-C
NPI 1558500397 · Medical Oncology Physician · Duarte, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Molly Diaz, PA-C is a Medical Oncology Physician provider in Duarte, CA (NPI 1558500397).
Provider details
- NPI number
- 1558500397
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- PA20108 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Physician Assistants & Advanced Practice Nursing Providers
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
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
243 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 201 | $131 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 42 | $145 |
Typical Medicare-allowed amounts for these services range $131–$145 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Imatinib Mesylate | 19 |
| Anastrozole | 18 |
| Nirogacestat Hydrobromidebrand: Ogsiveo | 17 |
| Regorafenibbrand: Stivarga | 14 |
| Diphenoxylate Hcl/Atropinebrand: Diphenoxylate-Atropine | 13 |
| Exemestane | 13 |
| Potassium Chloride | 13 |
| Dexamethasone | 11 |
| Pazopanib Hcl | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$626 across 19 records (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
Additional practice locations (1)
- 941 S Atlantic BlvdSuite 101Monterey Park, CA 91754-4722Phone: (626) 458-8401Fax: (626) 458-5606
Registry dates
- Enumerated
- 2009-02-18
- Last updated
- 2020-12-07
- Certified
- 2020-12-07
Frequently asked questions
- What is Molly Diaz's NPI number?
- Molly Diaz's National Provider Identifier (NPI) is 1558500397, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Molly Diaz's specialty?
- Molly Diaz is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Molly Diaz located?
- Molly Diaz's practice location on file with NPPES is 1500 Duarte Rd, Duarte, CA 91010-3012.
- What is Molly Diaz's phone number?
- The practice phone number listed in the NPPES registry for Molly Diaz is (626) 256-4673.
- Does Molly Diaz accept Medicare?
- Molly Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Molly Diaz's NPI active?
- Yes — Molly Diaz's NPI (1558500397) is active in the NPPES registry as of the last update on 2020-12-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.