Dr. John Charles Pfeffer, MD
- Medicare services, 2024
- 351
- Medicare patients, 2024
- 201
- Part D claims, 2024
- 1,972
- MIPS score, 2024
- 86
- Industry payments
- $84,873
- Practice address
- 1541 Florida Ave, Modesto, CA 95350
- Practice phone
- Call (209) 521-1533
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
First Choice Physician Partners
Modesto, California
Find Dr. Pfeffer'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. John Charles Pfeffer is an OB-GYN in Modesto, California
Dr. Pfeffer practices at First Choice Physician Partners in Modesto, California.
Dr. Pfeffer's NPI, 1851456602, was assigned on December 22, 2006. Dr. Pfeffer graduated from Carver College of Medicine in 1977. Dr. Pfeffer's California license number on file is C400620.
- NPI
- 1851456602NPI Registry (opens in a new tab)
- NPI enumeration date
- December 22, 2006
- NPI status
- Active
- Practice phone
- (209) 521-1533
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 75
- Medical school graduation
- 1977
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. John Charles Pfeffer practices at First Choice Physician Partners in Modesto, California
Dr. Pfeffer's primary practice is First Choice Physician Partners, at 1541 Florida Ave, Modesto, CA 95350 in Stanislaus County. The practice phone is (209) 521-1533.
- First Choice Physician Partners1541 Florida Ave, Modesto, CA 95350 · Stanislaus CountyPhone(209) 521-1533
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John Charles Pfeffer is affiliated with 2 sites of care and 1 medical group
Dr. Pfeffer's primary practice is First Choice Physician Partners in Modesto, California. The medical group on file is Greater Modesto Medical Surgical Associates. Dmand AI also links Dr. Pfeffer 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. John Charles Pfeffer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Pfeffer practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| First Choice Physician Partners | 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. John Charles Pfeffer is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Pfeffer's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Pfeffer is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dmand AI has Dr. Pfeffer's licenses on file in 3 states: California, Iowa and Minnesota.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
- Iowa license
- Minnesota license
Clinical focus
Dmand AI lists bladder disease, hysterectomy, menopause, ovarian cyst, pelvic prolapse, UTI, vaginal infection and vaginal prolapse repair among the conditions Dr. Pfeffer treats.
OB-GYNs near Dr. Pfeffer
Counts of OB-GYNs 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. John Charles Pfeffer billed Medicare for 351 services in 2024
CMS data shows 351 Medicare services from Dr. Pfeffer across 5 procedure codes in 2024, for 201 Medicare patients. Medicare paid $22,333 for them. Every service was in an office.
Dr. Pfeffer's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1552024: 25766%
- Other services
- 2023: 1492024: 9437%
Dr. Pfeffer compared with the California median for OB-GYNs, 2024
- Dr. Pfeffer
- California median
- Medicare services
- 351vs 586.1 times
- Medicare patients
- 201vs 523.9 times
- Part D claims
- 1,711vs 3548.9 times
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Pfeffer'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Pfeffer and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Charles Pfeffer treated 201 Medicare patients in 2024, average age 71
CMS counts 201 Medicare patients who saw Dr. Pfeffer in 2024. The largest group is 65 to 74, with 119 patients. 69% of them have high cholesterol, and 57% have high blood pressure. 10% are also on Medicaid. Their average risk score is 0.72, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Pfeffer's median patient age at 55, with 97% women.
Dr. Pfeffer's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Pfeffer's Medicare patients, 2024
- High cholesterol69%
- High blood pressure57%
- Arthritis39%
- Anxiety23%
- Osteoporosis18%
- Cancer17%
- Diabetes17%
- Mood disorders14%
Share of Medicare patients with each condition. A patient can have several.
Dr. Pfeffer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women97%
- Men1%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Charles Pfeffer wrote 1,972 Medicare Part D claims in 2024
In 2024, Dr. Pfeffer wrote 1,972 Medicare Part D claims for 478 patients. 84% of them were for generic drugs. CMS names the drug for 1,711 of them, across 34 drugs with 11 or more claims each, at $219,649 in total drug cost. In 2023, CMS named 1,430 claims across 28 drugs.
Dr. Pfeffer's Part D claims by kind of drug, 2024
- Generic1,657 claims84%
- Brand-name315 claims16%
Dr. Pfeffer'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. Pfeffer's Part D claims, 2024
- Opioids2%33 of 1,972 claims
- Antibiotics3%64 of 1,972 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: 1,4302024: 1,71120%
Drugs named by CMS: 34 in 2024, 28 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
Dr. John Charles Pfeffer scored 86 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 86 out of 100 for Dr. Pfeffer for performance year 2024, reported as part of a group.
Dr. Pfeffer's MIPS scores, performance year 2024
- 86of 100Final score
- 64.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 73of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John Charles Pfeffer received $84,873 in industry payments from 2016 to 2024
CMS Open Payments shows 253 general payments to Dr. Pfeffer from 40 drug and device companies from 2016 to 2024. Education make up the largest share, 62% of the total. Intuitive Surgical, Inc. paid the most, $80,589.
General payments to Dr. Pfeffer by program year, 2016 to 2024
General payments to Dr. Pfeffer by kind, 2016 to 2024
- Education$52,29362%
- Speaker and faculty fees$23,50028%
- Food and beverage$8,27610%
- Travel and lodging$8041%
Companies that paid Dr. Pfeffer the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Charles Pfeffer has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Pfeffer.
Awards and honors for Dr. Pfeffer
- Undated
- ACOG Fellow
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. John Charles Pfeffer graduated from Carver College of Medicine
Dr. Pfeffer graduated from Carver College of Medicine in 1977. Dr. Pfeffer is a member of American College of Obstetricians and Gynecologists and ACS.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. John Charles Pfeffer accepts plans from 9 insurance carriers
Dr. Pfeffer is in network with 9 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
- +1 more carriersWith a free account
Plan types Dr. Pfeffer accepts, by number of carriers
- Medicare8
- PPO6
- HMO5
- POS3
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Charles Pfeffer'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 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 | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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. John Charles Pfeffer
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. John Charles Pfeffer's NPI number?
Dr. John Charles Pfeffer's NPI number is 1851456602. It was assigned on December 22, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Charles Pfeffer?
Dr. John Charles Pfeffer is an OB-GYN in Modesto, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. John Charles Pfeffer practice?
Dr. Pfeffer practices at 1541 Florida Ave, Modesto, CA 95350. Dr. Pfeffer's primary practice is First Choice Physician Partners in Modesto, California. Dmand AI also links Dr. Pfeffer to 1 group practice or clinic.
What is Dr. John Charles Pfeffer's office phone number?
The practice phone on file for Dr. Pfeffer is (209) 521-1533.
What is Dr. John Charles Pfeffer's medical license number?
Dr. Pfeffer's California license number on file is C400620, one of the licenses on file in 3 states.
Which states has Dr. John Charles Pfeffer been licensed in?
Dmand AI has state licenses on file for Dr. Pfeffer in California (1981 to 2025), Iowa (1977 to 2015) and Minnesota (1979 to 2015).
What medical group is Dr. John Charles Pfeffer part of?
Dr. Pfeffer is linked to Greater Modesto Medical Surgical Associates.
Does Dr. John Charles Pfeffer accept Medicare?
Yes. CMS data shows Dr. Pfeffer billed Medicare for 351 services in 2024.
What is Dr. John Charles Pfeffer's MIPS score?
Dr. Pfeffer's MIPS final score for performance year 2024 is 86 out of 100, reported as part of a group.
How many Medicare patients does Dr. John Charles Pfeffer see?
CMS counts 201 Medicare patients who saw Dr. Pfeffer in 2024, with an average age of 71.
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Is Dr. John Charles Pfeffer board certified?
Yes. Dr. Pfeffer is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
What services does Dr. John Charles Pfeffer bill to Medicare?
In 2024, Dr. Pfeffer's most billed Medicare services were office visit, established patient (99213), medicare service (G0101) and office visit, new patient (99204).
Where did Dr. John Charles Pfeffer go to medical school?
Dr. Pfeffer graduated from Carver College of Medicine in 1977.
What drugs does Dr. John Charles Pfeffer prescribe most?
In 2024 Medicare Part D data, Dr. Pfeffer's most prescribed drugs by claims were Estradiol, Progesterone and Medroxyprogesterone Acetate.
Has Dr. John Charles Pfeffer received payments from drug or device companies?
CMS Open Payments shows $84,873 in general payments to Dr. Pfeffer from 40 companies from 2016 to 2024. The largest total came from Intuitive Surgical, Inc.
How long has Dr. John Charles Pfeffer been practicing?
Dr. Pfeffer graduated from medical school in 1977, 49 years ago.
What insurance does Dr. John Charles Pfeffer accept?
Dr. Pfeffer is in network with 9 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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