John Peter Halfen IV, PA
- Medicare patients, 2024
- 161
- Part D claims, 2024
- 2,567
- MIPS score, 2024
- 82
- Hospital affiliations
- 1
- Industry payments
- $22
- Practice address
- 1 The Embarcadero, San Francisco, CA 94111
- Practice phone
- Call (888) 663-6331
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
One Medical
San Francisco, California
Find John Halfen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
John Peter Halfen IV is a physician assistant in San Francisco, California
John Halfen practices at One Medical in San Francisco, California.
John Halfen's NPI, 1427533603, was assigned on October 3, 2018. John Halfen holds Colorado license PA.0005617.
- NPI
- 1427533603NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7315289865
- NPI enumeration date
- October 3, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (888) 663-6331
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
John Peter Halfen IV practices at One Medical in San Francisco, California
John Halfen's primary practice is One Medical, at 1 The Embarcadero, San Francisco, CA 94111 in San Francisco County. The practice phone is (888) 663-6331.
- One Medical1 The Embarcadero, San Francisco, CA 94111 · San Francisco CountyPhone(888) 663-6331
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John Peter Halfen IV is affiliated with 5 sites of care and 4 medical groups
John Halfen's primary practice is One Medical in San Francisco, California. John Halfen is also affiliated with CommonSpirit - St. Anthony North Hospital. The medical group on file is One Medical. Dmand AI also links John Halfen to 3 more group practices and clinics and 3 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at John Peter Halfen IV's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Halfen practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| One Medical | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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John Peter Halfen IV is one of 11,482 physician assistants in California
Physician assistant is John Halfen's primary specialty in the NPI Registry, under taxonomy code 363A00000X. John Halfen is licensed in Colorado.
Specialties and state licenses
- Physician assistant, ColoradoPrimary
Physician assistants near John Halfen
Counts of physician assistants 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
John Peter Halfen IV treated 161 Medicare patients in 2024, average age 73
CMS counts 161 Medicare patients who saw John Halfen in 2024. The largest group is 65 to 74, with 95 patients. 68% of them have high blood pressure, and 68% have high cholesterol. Their average risk score is 1.16, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Halfen's median patient age at 75, with 54% women.
John Halfen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
John Halfen's Medicare patients by sex, 2024
- Women7647%
- Men8553%
Chronic conditions among John Halfen's Medicare patients, 2024
- High blood pressure68%
- High cholesterol68%
- Arthritis46%
- Diabetes29%
- Chronic kidney disease23%
- Ischemic heart disease21%
- Depression19%
- Mood disorders19%
Share of Medicare patients with each condition. A patient can have several.
John Halfen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John Peter Halfen IV wrote 2,567 Medicare Part D claims in 2024
In 2024, John Halfen wrote 2,567 Medicare Part D claims for 527 patients. 85% of them were for generic drugs.
John Halfen's Part D claims by kind of drug, 2024
- Generic2,181 claims85%
- Brand-name362 claims14%
- Other24 claims1%
Drug classes CMS tracks in John Halfen's Part D claims, 2024
- Opioids4%97 of 2,567 claims
- Antibiotics4%105 of 2,567 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
John Peter Halfen IV scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for John Halfen for performance year 2024, reported as part of a group. John Halfen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
John Halfen's MIPS scores, performance year 2024
- 82of 100Final score
- 82.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 57of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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John Peter Halfen IV received $22 in industry payments in 2025
CMS Open Payments shows 1 general payment to John Halfen from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $22.
Companies that paid John Halfen the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for John Peter Halfen IV'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| 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 (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)Clinician Public Reporting: Overall MIPS Performance (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 John Peter Halfen IV
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John Peter Halfen IV's NPI number?
John Peter Halfen IV's NPI number is 1427533603. It was assigned on October 3, 2018, and it is active in the NPI Registry.
What does John Peter Halfen IV specialize in?
John Peter Halfen IV is a physician assistant in San Francisco, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does John Peter Halfen IV practice?
John Halfen practices at 1 The Embarcadero, San Francisco, CA 94111. John Halfen's primary practice is One Medical in San Francisco, California. Dmand AI also links John Halfen to 3 group practices and clinics and 3 medical groups.
What is John Peter Halfen IV's office phone number?
The practice phone on file for John Halfen is (888) 663-6331.
What is John Peter Halfen IV's medical license number?
John Halfen holds Colorado license PA.0005617.
Which hospitals is John Peter Halfen IV affiliated with?
John Halfen is affiliated with CommonSpirit - St. Anthony North Hospital.
What medical group is John Peter Halfen IV part of?
John Halfen is linked to One Medical. Dmand AI links John Halfen to 3 more medical groups.
Does John Peter Halfen IV accept Medicare?
Yes. CMS lists John Halfen as accepting Medicare assignment.
What is John Peter Halfen IV's MIPS score?
John Halfen's MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
How many Medicare patients does John Peter Halfen IV see?
CMS counts 161 Medicare patients who saw John Halfen in 2024, with an average age of 73.
Has John Peter Halfen IV received payments from drug or device companies?
CMS Open Payments shows $22 in general payments to John Halfen from 1 company from 2025 to 2025. The largest total came from Novo Nordisk Inc.
How long has John Peter Halfen IV been practicing?
John Halfen graduated from medical school in 2018, 8 years ago.
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