William Longfellow, M.D.
NPI 1669886545 · 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 1669886545).
Provider details
- NPI number
- 1669886545
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 0101262895 (VA)
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 tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
590 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 394 | $80 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 85 | $118 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 47 | $121 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 39 | $176 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 25 | $132 |
Typical Medicare-allowed amounts for these services range $80–$176 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 33 | 23 |
| Atorvastatin Calcium | 33 | 26 |
| Pantoprazole Sodium | 26 | 23 |
| Levothyroxine Sodium | 22 | 12 |
| Losartan Potassium | 21 | 16 |
| Metoprolol Succinate | 17 | 12 |
| Furosemide |
Practice location
Mailing address
Additional practice locations (1)
- 1500 Lansdowne AveDarby, PA 19023-1200Phone: (610) 237-4000
Registry dates
- Enumerated
- 2014-06-18
- Last updated
- 2020-12-23
- Certified
- 2020-12-22
Frequently asked questions
- What is William Longfellow's NPI number?
- William Longfellow's National Provider Identifier (NPI) is 1669886545, 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 Ste H1, Rancho Mirage, CA 92270-5518.
- 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 (1669886545) is active in the NPPES registry as of the last update on 2020-12-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.