Marcie Ryan, PAC
NPI 1821102393 · Physician Assistant · Danville, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcie Ryan, PAC is a Physician Assistant provider in Danville, CA (NPI 1821102393).
Provider details
- NPI number
- 1821102393
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PAC
- Sex
- Female
- Sole proprietor
- No
- License
- 21387 (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
19 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 · 55 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 144 | 84 |
| Rosuvastatin Calcium | 120 | 62 |
| Levothyroxine Sodium | 101 | 57 |
| Amlodipine Besylate | 100 | 52 |
| Tamsulosin Hcl | 60 | 31 |
| Gabapentin | 49 | 25 |
| Pantoprazole Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$200 across 8 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
- 2006-08-19
- Last updated
- 2017-09-15
Frequently asked questions
- What is Marcie Ryan's NPI number?
- Marcie Ryan's National Provider Identifier (NPI) is 1821102393, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcie Ryan's specialty?
- Marcie Ryan is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marcie Ryan located?
- Marcie Ryan's practice location on file with NPPES is 4165 Blackhawk Plaza Cir Ste 100, Danville, CA 94506-4691.
- What is Marcie Ryan's phone number?
- The practice phone number listed in the NPPES registry for Marcie Ryan is (925) 736-7070.
- Does Marcie Ryan accept Medicare?
- Marcie Ryan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcie Ryan's NPI active?
- Yes — Marcie Ryan's NPI (1821102393) is active in the NPPES registry as of the last update on 2017-09-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.