William Steven Longfellow, M.D.
Internal Medicine Physician · Rancho Mirage, CA
William Steven Longfellow, M.D. is an internal medicine physician with a practice address in Rancho Mirage, California, and NPI 1922149285, issued on Feb 9, 2007. Check the license (California A50581, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Steven Longfellow
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A50581 CA
Self-reported in NPPES; status is on the state search - Practice location
- 71780 San Jacinto Dr, Rancho Mirage, CA 92270
- Phone
- (760) 340-6777
- Enumerated
- Feb 9, 2007
- Record last updated
- Oct 10, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (760) 340-1146
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 71780 San Jacinto Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shelly Counts, R.N., BSNInfusion Therapy Registered Nurse1356516520
- Eddie Halasa, DDS,MSDEndodontics1962626861
- Cindy Huff, R.N.,MSNInfusion Therapy Registered Nurse1518132786
- Pushpinder Sivia, MDVascular Surgery Physician1619132719
Verify William Steven Longfellow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A50581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,139 Medicare Part D claims for 219 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium71 claims
- Levothyroxine Sodium61 claims
- Amlodipine Besylate58 claims
- Rosuvastatin Calcium41 claims
- Escitalopram Oxalate37 claims
- Irbesartan34 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
William Steven Longfellow among 17,696 internal medicine physician records in California
William Steven Longfellow, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2011 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
59 internal medicine physician records list a practice address in Rancho Mirage
They are 59 of the 1,600 NPPES records with a practice address in Rancho Mirage, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Rancho Mirage → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Syed Azam, M.D.Rancho Mirage, CA 922701811993454
- Maria I. Encarnita Garcia, M.D.Rancho Mirage, CA 922701871537977
- Russell Grant, M.D.Rancho Mirage, CA 922701922026533
- Joel Hirschberg, MDRancho Mirage, CA 922701962474650
- David Ko, MDRancho Mirage, CA 922701568405470
- Carlos Lopez, M.D.,M.P.H.Rancho Mirage, CA 922701003892894
- Hessam Mahdavi, MDRancho Mirage, CA 922701851393300
- Ravinderpal Mann, M.D.Rancho Mirage, CA 922701568480721
Common questions
What is William Steven Longfellow, M.D.'s NPI number?
William Steven Longfellow, M.D.'s National Provider Identifier (NPI) is 1922149285, issued on Feb 9, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Steven Longfellow, M.D. located?
The NPPES record lists a practice address at 71780 San Jacinto Dr, Rancho Mirage, CA, 92270. Phone: (760) 340-6777. Providers update this record themselves, so call before visiting.
How can I verify William Steven Longfellow, M.D.'s license?
NPPES lists California license number A50581, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Steven Longfellow, M.D. prescribe under Medicare Part D?
In 2024, William Steven Longfellow, M.D. had 1,139 Medicare Part D claims for 219 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.