William Neff, M.D.
NPI 1821086513 · Anesthesiology Physician · Fort Collins, CO
William Neff, M.D. is a Anesthesiology Physician provider in Fort Collins, CO (NPI 1821086513).
Provider details
- NPI number
- 1821086513
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- H1994 (TX)
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 tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-07
- Last updated
- 2013-06-07
Frequently asked questions
- What is William Neff's NPI number?
- William Neff's National Provider Identifier (NPI) is 1821086513, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Neff's specialty?
- William Neff is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Neff located?
- William Neff's practice location on file with NPPES is 1236 E Elizabeth St, Fort Collins, CO 80524-4000.
- What is William Neff's phone number?
- The practice phone number listed in the NPPES registry for William Neff is (970) 224-2985.
- Is William Neff's NPI active?
- Yes — William Neff's NPI (1821086513) is active in the NPPES registry as of the last update on 2013-06-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.