Quick answers
- Does William F. Sigl accept Medicare assignment?
- Yes. Medicare's clinician data says William F. Sigl accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does William F. Sigl see?
- In 2024, CMS data shows 154 Original Medicare patients and 184 services for William F. Sigl. This counts Original Medicare only and measures volume, not quality.
- What is William F. Sigl's NPI number?
- 1952728974. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for William F. Sigl, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 154 |
|---|---|
| Services billed to Medicare | 184 |
| Different services or procedures | 35 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Anesthesia for lens surgery (00142)58 services
- Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)21 services
- Anesthesia for procedure for total knee joint replacement (01402)19 services
- Anesthesia for open or endoscopic total shoulder joint replacement (01638)15 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- Arthritis60%
- High cholesterol56%
- Diabetes22%
- Ischemic heart disease19%
- Depression16%
Hospitals where William F. Sigl works
Medicare's Facility Affiliation Data lists William F. Sigl at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Banner North Colorado Medical CenterGreeley, CO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 060001
Practice locations
Addresses where William F. Sigl is enrolled with Medicare (CMS data updated October 2, 2026).
- 1801 16th StGreeley, CO 80631 (970) 810‑4121
- 5890 W 13th St, Mountain Vista Surg CtrGreeley, CO 80634 (970) 810‑0090
Group practices
Medicare enrollment lists William F. Sigl as a member of this group (CMS data updated October 2, 2026).
- Rocky Mountain State Anesthesia Providers50 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Greeley
Clinicians with the same Medicare primary specialty in Greeley, CO — not a recommendation.
Other clinicians in Rocky Mountain State Anesthesia Providers
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Southwestern Medical School At Dallas |
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1952728974 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians