Tammy Darby, PA-C
NPI 1265828370 · Physician Assistant · Pomona, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tammy Darby, PA-C is a Physician Assistant provider in Pomona, CA (NPI 1265828370).
Provider details
- NPI number
- 1265828370
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- 52376 (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 tenure33% of score
11 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 46 | 22 |
| Amlodipine Besylate | 26 | 11 |
| Alendronate Sodium | 20 | — |
| Metformin Hcl | 19 | 11 |
| Losartan Potassium | 16 | 11 |
| Simvastatin | 13 | — |
| Hydrochlorothiazide | 11 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$39 across 2 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
Registry dates
- Enumerated
- 2015-04-15
- Last updated
- 2022-11-09
- Certified
- 2022-11-09
Frequently asked questions
- What is Tammy Darby's NPI number?
- Tammy Darby's National Provider Identifier (NPI) is 1265828370, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tammy Darby's specialty?
- Tammy Darby is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Tammy Darby located?
- Tammy Darby's practice location on file with NPPES is 2740 N Garey Ave Ste 100, Pomona, CA 91767-1800.
- What is Tammy Darby's phone number?
- The practice phone number listed in the NPPES registry for Tammy Darby is (909) 623-2300.
- Does Tammy Darby accept Medicare?
- Tammy Darby is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tammy Darby's NPI active?
- Yes — Tammy Darby's NPI (1265828370) is active in the NPPES registry as of the last update on 2022-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.