Dr. Jeff Michael Hamman, MD
- Part D claims, 2024
- 7,124
- Hospital affiliations
- 1
- Medical group
- 1
- Insurance carriers
- 2
- State licenses
- 2
- Practice address
- 7373 West Ln, Stockton, CA 95210
- Practice phone
- Call (209) 476-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Permanente Medical Group Inc
Stockton, California
Find Dr. Hamman'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. Jeff Michael Hamman is an internist in Stockton, California
Dr. Hamman practices at Permanente Medical Group Inc in Stockton, California.
Dr. Hamman's NPI, 1972706315, was assigned on June 5, 2007. Dr. Hamman graduated from University of Illinois College of Medicine - Chicago in 2004. Dr. Hamman holds Indiana license 11012036A.
- NPI
- 1972706315NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224197967
- NPI enumeration date
- June 5, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 476-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jeff Michael Hamman practices at Permanente Medical Group Inc in Stockton, California
Dr. Hamman's primary practice is Permanente Medical Group Inc, at 7373 West Ln, Stockton, CA 95210 in San Joaquin County. The practice phone is (209) 476-2000.
- Permanente Medical Group Inc7373 West Ln, Stockton, CA 95210 · San Joaquin CountyPhone(209) 476-2000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Jeff Michael Hamman is affiliated with 3 sites of care and 1 medical group
Dr. Hamman's primary practice is Permanente Medical Group Inc in Stockton, California. Dr. Hamman is also affiliated with Kaiser Permanente South Sacramento Medical Center. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Hamman to 1 more group practice or clinic, 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 Dr. Jeff Michael Hamman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hamman practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Permanente Medical Group Inc | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jeff Michael Hamman is one of 16,751 internists in California
Internal medicine is Dr. Hamman's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Hamman is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Hamman's licenses on file in 2 states: Indiana and California.
Specialties and state licenses
- Internal medicine, IndianaPrimary
- California license
Clinical focus
Dmand AI lists lower back pain among the conditions Dr. Hamman treats.
Internists near Dr. Hamman
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. Jeff Michael Hamman's patients have a median age of 59
Across all payers, Dmand AI patient panel data puts Dr. Hamman's median patient age at 59, with 45% women.
Dr. Hamman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women45%
- Men55%
Source: Dmand AI Patient Panel Data
Dr. Jeff Michael Hamman wrote 7,124 Medicare Part D claims in 2024
In 2024, Dr. Hamman wrote 7,124 Medicare Part D claims for 729 patients. 91% of them were for generic drugs. CMS names the drug for 6,510 of them, across 102 drugs with 11 or more claims each, at $274,492 in total drug cost. In 2023, CMS named 6,330 claims across 93 drugs.
Dr. Hamman's Part D claims by kind of drug, 2024
- Generic6,506 claims91%
- Brand-name564 claims8%
- Other54 claims1%
Dr. Hamman'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. Hamman's Part D claims, 2024
- Opioids2%160 of 7,124 claims
- Antibiotics3%215 of 7,124 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: 6,3302024: 6,5103%
Drugs named by CMS: 102 in 2024, 93 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. Jeff Michael Hamman takes part in Medicare
Dr. Hamman 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. Jeff Michael Hamman has 1 award and honors on record
Dmand AI lists 1 award for Dr. Hamman, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Hamman
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Jeff Michael Hamman graduated from University of Illinois College of Medicine - Chicago
Dr. Hamman graduated from University of Illinois College of Medicine - Chicago in 2004.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Jeff Michael Hamman accepts plans from 2 insurance carriers
Dr. Hamman is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Hamman accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jeff Michael Hamman'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 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) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Jeff Michael Hamman
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. Jeff Michael Hamman's NPI number?
Dr. Jeff Michael Hamman's NPI number is 1972706315. It was assigned on June 5, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Jeff Michael Hamman?
Dr. Jeff Michael Hamman is an internist in Stockton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Jeff Michael Hamman practice?
Dr. Hamman practices at 7373 West Ln, Stockton, CA 95210. Dr. Hamman's primary practice is Permanente Medical Group Inc in Stockton, California. Dmand AI also links Dr. Hamman to 1 group practice or clinic.
What is Dr. Jeff Michael Hamman's office phone number?
The practice phone on file for Dr. Hamman is (209) 476-2000.
What is Dr. Jeff Michael Hamman's medical license number?
Dr. Hamman holds Indiana license 11012036A, one of the licenses on file in 2 states.
Which states has Dr. Jeff Michael Hamman been licensed in?
Dmand AI has state licenses on file for Dr. Hamman in Indiana and California (2008 to 2025).
Which hospitals is Dr. Jeff Michael Hamman affiliated with?
Dr. Hamman is affiliated with Kaiser Permanente South Sacramento Medical Center.
What medical group is Dr. Jeff Michael Hamman part of?
Dr. Hamman is linked to The Permanente Medical Group, Inc.
Does Dr. Jeff Michael Hamman accept Medicare?
Yes. CMS lists Dr. Hamman as accepting Medicare assignment.
Is Dr. Jeff Michael Hamman board certified?
Yes. Dr. Hamman is board certified in internal medicine by the American Board of Internal Medicine.
Show 4 more questionsShow fewer questions
Where did Dr. Jeff Michael Hamman go to medical school?
Dr. Hamman graduated from University of Illinois College of Medicine - Chicago in 2004.
What drugs does Dr. Jeff Michael Hamman prescribe most?
In 2024 Medicare Part D data, Dr. Hamman's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
How long has Dr. Jeff Michael Hamman been practicing?
Dr. Hamman graduated from medical school in 2004, 22 years ago.
What insurance does Dr. Jeff Michael Hamman accept?
Dr. Hamman is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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