William Shaffer, M.D.
NPI 1801044722 · Neurology Physician · Boulder, CO
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Shaffer, M.D. is a Neurology Physician provider in Boulder, CO (NPI 1801044722).
Provider details
- NPI number
- 1801044722
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036.121384 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
215 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 | 93 | $182 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 82 | $220 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 40 | $32 |
Typical Medicare-allowed amounts for these services range $32–$220 (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 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Baclofen | 130 | 36 |
| Diclofenac Sodium | 108 | 45 |
| Interferon Beta-1a/Albuminbrand: Rebif Rebidose | 105 | 14 |
| Lacosamide | 102 | 41 |
| Verapamil Hcl | 81 | 21 |
| Amitriptyline Hcl | 70 | 18 |
| Interferon Beta-1a/Albuminbrand: Rebif | 69 | 13 |
| Teriflunomidebrand: Aubagio |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$39,781 across 29 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)
- 2315 E Harmony RdSuite 110Fort Collins, CO 80528-8620Phone: (970) 482-4373Fax: (970) 484-5682
Registry dates
- Enumerated
- 2008-09-04
- Last updated
- 2024-09-27
- Certified
- 2024-09-27
Frequently asked questions
- What is William Shaffer's NPI number?
- William Shaffer's National Provider Identifier (NPI) is 1801044722, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Shaffer's specialty?
- William Shaffer is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is William Shaffer located?
- William Shaffer's practice location on file with NPPES is 4801 Riverbend Rd Ste 200, Boulder, CO 80301-2613.
- What is William Shaffer's phone number?
- The practice phone number listed in the NPPES registry for William Shaffer is (303) 415-8800.
- Does William Shaffer accept Medicare?
- William Shaffer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Shaffer's NPI active?
- Yes — William Shaffer's NPI (1801044722) is active in the NPPES registry as of the last update on 2024-09-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.