Dr. Jan Diamond, MD
- Medicare services, 2018
- 62
- Part D claims, 2024
- 15
- Industry payments
- $322,746
- Affiliated sites
- 2
- Medical group
- 1
- Practice address
- 616 16th Street, Oakland, CA 94612
- Practice phone
- Call (610) 918-4122
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Downtown Oakland Health Center
FQHC - Main Site · Oakland, California
Find Dr. Diamond'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.
Dr. Jan Diamond is a family medicine physician in Oakland, California
Dr. Diamond practices at Downtown Oakland Health Center in Oakland, California.
Dr. Diamond's NPI, 1326116898, was assigned on December 1, 2006. Dr. Diamond graduated from UCSF School of Medicine in 1984. Dr. Diamond's California license number on file is G57275.
- NPI
- 1326116898NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082891544
- NPI enumeration date
- December 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (610) 918-4122
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 71
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jan Diamond practices at 2 locations in Oakland, California
Dr. Diamond's primary practice is Downtown Oakland Health Center, at 616 16th Street, Oakland, CA 94612 in Alameda County. The practice phone is (610) 918-4122. Dr. Diamond also practices at Lifelong Medical Care -Downtown Oakland Clinic, 10700 Macarthur Blvd, Oakland, CA 94605.
- Downtown Oakland Health CenterPrimary616 16th Street, Oakland, CA 94612 · Alameda CountyPhone(610) 918-4122
- Lifelong Medical Care -Downtown Oakland Clinic10700 Macarthur Blvd, Oakland, CA 94605 · Alameda CountyPhone(510) 451-4270
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Jan Diamond is affiliated with 2 sites of care and 1 medical group
Dr. Diamond's primary practice is Downtown Oakland Health Center in Oakland, California. The medical group on file is LifeLong Medical Care. Dmand AI also links Dr. Diamond to 1 more community health center, named with a free account. Dr. Diamond's employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jan Diamond's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diamond practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Downtown Oakland Health Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jan Diamond is one of 15,680 family medicine physicians in California
Family medicine is Dr. Diamond's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Diamond is board certified in family medicine by the American Board of Family Medicine. Dmand AI has Dr. Diamond's licenses on file in 2 states: California and Washington.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
- Washington license
Family medicine physicians near Dr. Diamond
Counts of family medicine physicians 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. Jan Diamond billed Medicare for 62 services in 2018
CMS data shows 62 Medicare services from Dr. Diamond across 2 procedure codes in 2018, all of them office visits. Medicare paid $3,131 for them. Every service was in an office.
Dr. Diamond's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 1332018: 6253%
Dr. Diamond compared with the California median for family medicine physicians, 2018
- Dr. Diamond
- California median
- Medicare services
- 62vs 24675% below
- Part D claims
- 129vs 83385% below
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Diamond's most billed Medicare procedure codes, 2018
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. Jan Diamond's patients have a median age of 58
Across all payers, Dmand AI patient panel data puts Dr. Diamond's median patient age at 58, with 54% women.
Dr. Diamond's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women54%
- Men42%
Source: Dmand AI Patient Panel Data
Dr. Jan Diamond wrote 15 Medicare Part D claims in 2024
In 2024, Dr. Diamond wrote 15 Medicare Part D claims. They cover 7 drugs, with $12,308 in total drug cost. In 2021, CMS named 591 claims across 30 drugs.
Dr. Diamond's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 5912022: 12978%
Drugs named by CMS: 7 in 2022, 30 in 2021.
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. Jan Diamond takes part in Medicare
Dr. Diamond 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. Jan Diamond received $322,746 in industry payments from 2016 to 2025
CMS Open Payments shows 484 general payments to Dr. Diamond from 5 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 67% of the total. Gilead Sciences, Inc. paid the most, $246,082.
General payments to Dr. Diamond by program year, 2016 to 2025
General payments to Dr. Diamond by kind, 2016 to 2025
- Speaker and faculty fees$216,92067%
- Consulting fees$52,04016%
- Travel and lodging$41,65013%
- Food and beverage$12,1374%
Companies that paid Dr. Diamond the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jan Diamond graduated from UCSF School of Medicine
Dr. Diamond graduated from UCSF School of Medicine in 1984.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Dr. Jan Diamond accepts plans from 3 insurance carriers
Dr. Diamond is in network with 3 carriers, including Elevance, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
Plan types Dr. Diamond accepts, by number of carriers
- Medicare3
- PPO3
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jan Diamond'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 Affiliation DataDmand AI Practice 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 Data |
| 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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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. Jan Diamond
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. Jan Diamond's NPI number?
Dr. Jan Diamond's NPI number is 1326116898. It was assigned on December 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Jan Diamond?
Dr. Jan Diamond is a family medicine physician in Oakland, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Jan Diamond practice?
Dr. Diamond practices at 616 16th Street, Oakland, CA 94612. Dr. Diamond also practices at 10700 Macarthur Blvd, Oakland, CA 94605. Dr. Diamond's primary practice is Downtown Oakland Health Center in Oakland, California. Dmand AI also links Dr. Diamond to 1 community health center.
What is Dr. Jan Diamond's office phone number?
The practice phone on file for Dr. Diamond is (610) 918-4122.
What is Dr. Jan Diamond's medical license number?
Dr. Diamond's California license number on file is G57275, one of the licenses on file in 2 states.
Which states has Dr. Jan Diamond been licensed in?
Dmand AI has state licenses on file for Dr. Diamond in California (1986 to 2025) and Washington (1984 to 1985).
What medical group is Dr. Jan Diamond part of?
Dr. Diamond is linked to LifeLong Medical Care.
Does Dr. Jan Diamond accept Medicare?
Yes. CMS data shows Dr. Diamond billed Medicare for 62 services in 2018, and Dr. Diamond accepts Medicare assignment.
Is Dr. Jan Diamond board certified?
Yes. Dr. Diamond is board certified in family medicine by the American Board of Family Medicine.
What services does Dr. Jan Diamond bill to Medicare?
In 2018, Dr. Diamond's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
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Where did Dr. Jan Diamond go to medical school?
Dr. Diamond graduated from UCSF School of Medicine in 1984.
What drugs does Dr. Jan Diamond prescribe most?
In 2022 Medicare Part D data, Dr. Diamond's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Hydrochlorothiazide.
Has Dr. Jan Diamond received payments from drug or device companies?
CMS Open Payments shows $322,746 in general payments to Dr. Diamond from 5 companies from 2016 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Jan Diamond been practicing?
Dr. Diamond graduated from medical school in 1984, 42 years ago.
What insurance does Dr. Jan Diamond accept?
Dr. Diamond is in network with 3 carriers, including Elevance, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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