William Longfellow, M.D.
NPI 1922149285 · Internal Medicine Physician · Rancho Mirage, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Longfellow, M.D. is a Internal Medicine Physician provider in Rancho Mirage, CA (NPI 1922149285).
Provider details
- NPI number
- 1922149285
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A50581 (CA)
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 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 71 | 32 |
| Levothyroxine Sodium | 61 | 30 |
| Amlodipine Besylate | 58 | 34 |
| Rosuvastatin Calcium | 41 | 22 |
| Escitalopram Oxalate | 37 | 16 |
| Irbesartan | 34 | 22 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-09
- Last updated
- 2011-10-10
Frequently asked questions
- What is William Longfellow's NPI number?
- William Longfellow's National Provider Identifier (NPI) is 1922149285, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Longfellow's specialty?
- William Longfellow is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Longfellow located?
- William Longfellow's practice location on file with NPPES is 71780 San Jacinto Dr, Rancho Mirage, CA 92270-5516.
- What is William Longfellow's phone number?
- The practice phone number listed in the NPPES registry for William Longfellow is (760) 340-6777.
- Does William Longfellow accept Medicare?
- William Longfellow is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Longfellow's NPI active?
- Yes — William Longfellow's NPI (1922149285) is active in the NPPES registry as of the last update on 2011-10-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.