Dr. William Hardy Longfellow, MD
- Medicare services, 2024
- 590
- Medicare patients, 2024
- 177
- Part D claims, 2024
- 679
- Hospital affiliations
- 1
- Industry payments
- $803
- Practice address
- 7901 Frost St, San Diego, CA 92123
- Practice phone
- Call (858) 939-3400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Longfellow's professional email, personal email and mobile number
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Dr. William Hardy Longfellow is an internist in San Diego, California
Dr. Longfellow practices at Sharp Memorial Hospital in San Diego, California, part of Sharp HealthCare.
Dr. Longfellow's NPI, 1669886545, was assigned on June 18, 2014. Dr. Longfellow holds California license A169852.
- NPI
- 1669886545NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7214259217
- NPI enumeration date
- June 18, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (858) 939-3400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Hardy Longfellow practices at Sharp Memorial Hospital in San Diego, California
Dr. Longfellow's primary practice is Sharp Memorial Hospital, at 7901 Frost St, San Diego, CA 92123 in San Diego County. The practice phone is (858) 939-3400.
- Sharp Memorial Hospital7901 Frost St, San Diego, CA 92123 · San Diego CountyPhone(858) 939-3400
Source: Dmand AI Affiliation Data
Dr. William Hardy Longfellow is affiliated with 1 site of care and 3 medical groups
Dr. Longfellow's primary practice is Sharp Memorial Hospital in San Diego, California, part of Sharp HealthCare. The medical group on file is FocusHealth. Dmand AI also links Dr. Longfellow to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Hardy Longfellow's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Longfellow practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sharp Memorial Hospital | Available with a free account |
| +2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Sharp HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. William Hardy Longfellow is one of 16,751 internists in California
Internal medicine is Dr. Longfellow's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Longfellow's licenses on file in 2 states: California and Virginia.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Virginia license
Internists near Dr. Longfellow
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Hardy Longfellow billed Medicare for 590 services in 2024
CMS data shows 590 Medicare services from Dr. Longfellow across 5 procedure codes in 2024, for 177 Medicare patients. Medicare paid $45,639 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Longfellow's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 9712024: 59039%
Dr. Longfellow compared with the California median for internists, 2024
- Dr. Longfellow
- California median
- Medicare services
- 590vs 36163% above
- Medicare patients
- 177vs 15117% above
- Part D claims
- 272vs 42135% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Longfellow's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Hardy Longfellow treated 177 Medicare patients in 2024, average age 76
CMS counts 177 Medicare patients who saw Dr. Longfellow in 2024. The largest group is 75 to 84, with 58 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 49% are also on Medicaid. Their average risk score is 2.71, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Longfellow's median patient age at 76, with 46% women.
Dr. Longfellow's Medicare patients by age, 2024
Dr. Longfellow's Medicare patients by sex, 2024
- Women9353%
- Men8447%
Chronic conditions among Dr. Longfellow's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis60%
- Diabetes54%
- Ischemic heart disease54%
- Chronic kidney disease51%
- Mood disorders50%
- Heart failure49%
Share of Medicare patients with each condition. A patient can have several.
Dr. Longfellow's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women46%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Hardy Longfellow wrote 679 Medicare Part D claims in 2024
In 2024, Dr. Longfellow wrote 679 Medicare Part D claims for 208 patients. 91% of them were for generic drugs. CMS names the drug for 272 of them, across 15 drugs with 11 or more claims each, at $13,786 in total drug cost. In 2023, CMS named 850 claims across 32 drugs.
Dr. Longfellow's Part D claims by kind of drug, 2024
- Generic615 claims91%
- Brand-name and other64 claims9%
Dr. Longfellow's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Longfellow's Part D claims, 2024
- Opioids3%23 of 679 claims
- Antibiotics5%37 of 679 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8502024: 27268%
Drugs named by CMS: 15 in 2024, 32 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. William Hardy Longfellow takes part in Medicare
Dr. Longfellow accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. William Hardy Longfellow received $803 in industry payments from 2016 to 2021
CMS Open Payments shows 24 general payments to Dr. Longfellow from 14 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 100% of the total. Genentech, Inc. paid the most, $224.
General payments to Dr. Longfellow by program year, 2016 to 2021
Companies that paid Dr. Longfellow the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William Hardy Longfellow's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Hardy Longfellow
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William Hardy Longfellow's NPI number?
Dr. William Hardy Longfellow's NPI number is 1669886545. It was assigned on June 18, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. William Hardy Longfellow?
Dr. William Hardy Longfellow is an internist in San Diego, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William Hardy Longfellow practice?
Dr. Longfellow practices at 7901 Frost St, San Diego, CA 92123. Dr. Longfellow's primary practice is Sharp Memorial Hospital in San Diego, California, part of Sharp HealthCare. Dmand AI also links Dr. Longfellow to 2 medical groups.
What is Dr. William Hardy Longfellow's office phone number?
The practice phone on file for Dr. Longfellow is (858) 939-3400.
What is Dr. William Hardy Longfellow's medical license number?
Dr. Longfellow holds California license A169852, one of the licenses on file in 2 states.
Which states has Dr. William Hardy Longfellow been licensed in?
Dmand AI has state licenses on file for Dr. Longfellow in California and Virginia.
Which hospitals is Dr. William Hardy Longfellow affiliated with?
Dr. Longfellow practices at Sharp Memorial Hospital in San Diego, California.
What medical group is Dr. William Hardy Longfellow part of?
Dr. Longfellow is linked to FocusHealth. Dmand AI links Dr. Longfellow to 2 more medical groups.
Does Dr. William Hardy Longfellow accept Medicare?
Yes. CMS data shows Dr. Longfellow billed Medicare for 590 services in 2024, and Dr. Longfellow accepts Medicare assignment.
How many Medicare patients does Dr. William Hardy Longfellow see?
CMS counts 177 Medicare patients who saw Dr. Longfellow in 2024, with an average age of 76.
Show 4 more questionsShow fewer questions
What services does Dr. William Hardy Longfellow bill to Medicare?
In 2024, Dr. Longfellow's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99239) and hospital inpatient care (99233).
What drugs does Dr. William Hardy Longfellow prescribe most?
In 2024 Medicare Part D data, Dr. Longfellow's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Pantoprazole Sodium.
Has Dr. William Hardy Longfellow received payments from drug or device companies?
CMS Open Payments shows $803 in general payments to Dr. Longfellow from 14 companies from 2016 to 2021. The largest total came from Genentech, Inc.
How long has Dr. William Hardy Longfellow been practicing?
Dr. Longfellow graduated from medical school in 2014, 12 years ago.
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