William Cullis, MD
NPI 1174685374 · Family Medicine Physician · Ronan, MT
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Cullis, MD is a Family Medicine Physician provider in Ronan, MT (NPI 1174685374).
Provider details
- NPI number
- 1174685374
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 8425 (MT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Sitagliptin Phosphatebrand: Januvia | 48 |
| Potassium Chloride | 13 |
| Quetiapine Fumarate | 13 |
| Torsemide | 13 |
| Isosorbide Mononitratebrand: Isosorbide Mononitrate Er | 12 |
| Rosuvastatin Calcium | 12 |
| Fluoxetine Hcl | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-14
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Cullis's NPI number?
- William Cullis's National Provider Identifier (NPI) is 1174685374, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Cullis's specialty?
- William Cullis is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Cullis located?
- William Cullis's practice location on file with NPPES is 126 6th Ave Sw, Ronan, MT 59864-2600.
- What is William Cullis's phone number?
- The practice phone number listed in the NPPES registry for William Cullis is (406) 676-3600.
- Does William Cullis accept Medicare?
- William Cullis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Cullis's NPI active?
- Yes — William Cullis's NPI (1174685374) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.