Andrea Williams, PA-C
NPI 1639957871 · Physician Assistant · Thornton, CO
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrea Williams, PA-C is a Physician Assistant provider in Thornton, CO (NPI 1639957871).
Provider details
- NPI number
- 1639957871
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- PA.0007992 (CO)
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
2 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
46 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) |
|---|---|---|
| Replacement of Knee Joint, Both Sides of Knee27447 | 31 | $174 |
| Replacement of Thigh Bone and Hip Joint With Prosthesis27130 | 15 | $173 |
Typical Medicare-allowed amounts for these services range $173–$174 (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 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 225 | 117 |
| Oxycodone Hcl | 120 | 90 |
| Amoxicillin | 78 | 66 |
| Tramadol Hcl | 74 | 43 |
| Ondansetronbrand: Ondansetron Odt | 63 | 62 |
| Methocarbamol | 61 | 51 |
| Cefadroxil | 34 | 34 |
| Naloxone Hcl | 31 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$210 across 9 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
- 2023-09-19
- Last updated
- 2026-04-23
- Certified
- 2026-04-23
Frequently asked questions
- What is Andrea Williams's NPI number?
- Andrea Williams's National Provider Identifier (NPI) is 1639957871, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrea Williams's specialty?
- Andrea Williams is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Andrea Williams located?
- Andrea Williams's practice location on file with NPPES is 9005 Grant St Ste 200, Thornton, CO 80229-4384.
- What is Andrea Williams's phone number?
- The practice phone number listed in the NPPES registry for Andrea Williams is (303) 287-2800.
- Does Andrea Williams accept Medicare?
- Andrea Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrea Williams's NPI active?
- Yes — Andrea Williams's NPI (1639957871) is active in the NPPES registry as of the last update on 2026-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.