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Dr. Peter Marshall Gaines, MD
NPI1912915380PAC ID9133157910
- Medicare services, 2019
- 81
- Part D claims, 2024
- 140
- Publications
- 2
- Industry payments
- $98
- Affiliated sites
- 3
- Practice address
- 1910 Customer Care Way, Atwater, CA 95301
- Practice phone
- Call (209) 384-6424
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
GVHC - Atwater Administrative Offices
FQHC - Satellite Clinic · Atwater, California
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Dr. Peter Marshall Gaines is a family medicine physician in Atwater, California
Dr. Gaines practices at GVHC - Atwater Administrative Offices in Atwater, California.
Dr. Gaines' NPI, 1912915380, was assigned on August 3, 2006. Dr. Gaines holds California license G64747.
NPI and contact details
- NPI
- 1912915380NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9133157910
- NPI enumeration date
- August 3, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 384-6424
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Peter Marshall Gaines practices at GVHC - Atwater Administrative Offices in Atwater, California
Dr. Gaines' primary practice is GVHC - Atwater Administrative Offices, at 1910 Customer Care Way, Atwater, CA 95301 in Merced County. The practice phone is (209) 384-6424.
- GVHC - Atwater Administrative Offices1910 Customer Care Way, Atwater, CA 95301 · Merced CountyPhone(209) 384-6424
Source: Dmand AI Affiliation Data
Dr. Peter Marshall Gaines is affiliated with 3 sites of care and 2 medical groups
Dr. Gaines' primary practice is GVHC - Atwater Administrative Offices in Atwater, California. The medical group on file is Golden Valley Health Centers. Dmand AI also links Dr. Gaines to 1 more community health center, 1 group practice or clinic and 1 medical group, each named with a free account. Dr. Gaines' employer is on file too: a community health center (fqhc).
GVHC - Atwater Administrative OfficesPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Peter Marshall Gaines' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gaines practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| GVHC - Atwater Administrative Offices | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Peter Marshall Gaines is one of 15,680 family medicine physicians in California
Family medicine is Dr. Gaines' primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Gaines is licensed in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Gaines
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. Peter Marshall Gaines billed Medicare for 81 services in 2019
CMS data shows 81 Medicare services from Dr. Gaines across 3 procedure codes in 2019. Medicare paid $5,512 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201981
Paid by Medicare$5,512
Procedure codes3
Dr. Gaines' Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 1932019: 8158%
Dr. Gaines compared with the California median for family medicine physicians, 2019
- Dr. Gaines
- California median
- Medicare services
- 81vs 24667% below
- Part D claims
- 12vs 83399% below
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Gaines' most billed Medicare procedure codes, 2019
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. Gaines and other family medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Peter Marshall Gaines' patients have a median age of 60
Across all payers, Dmand AI patient panel data puts Dr. Gaines' median patient age at 60, with 57% women.
Dr. Gaines' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women57%
- Men43%
Source: Dmand AI Patient Panel Data
Dr. Peter Marshall Gaines wrote 140 Medicare Part D claims in 2024
In 2024, Dr. Gaines wrote 140 Medicare Part D claims for 39 patients. 78% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $345 in total drug cost. In 2020, CMS named 1,648 claims across 44 drugs.
Part D claims, 2024140
Drugs named by CMS1
Total drug cost$345
Part D patients39
Dr. Gaines' Part D claims by kind of drug, 2024
- Generic109 claims78%
- Brand-name and other31 claims22%
Dr. Gaines' most prescribed drugs by claims, 2023
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, 2020 to 2023
- 2020
- 2023
- Claims for drugs CMS names
- 2020: 1,6482023: 1299%
Drugs named by CMS: 1 in 2023, 44 in 2020.
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. Peter Marshall Gaines takes part in Medicare
Dr. Gaines 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. Peter Marshall Gaines has 2 publications on record
Dmand AI links 2 papers to Dr. Gaines, published from 2014 to 2017. Dr. Gaines' most frequent co-author is Stephanie Halene, MD.
Papers2
Years published2014 to 2017
Dr. Gaines' most frequent co-authors
Recent publications by Dr. Gaines
See who Dr. Gaines researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gaines works with, so you can find a warm path to the right family medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Peter Marshall Gaines received $98 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Gaines from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $98.
Companies that paid Dr. Gaines 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 Dr. Peter Marshall Gaines'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 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Peter Marshall Gaines
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. Peter Marshall Gaines' NPI number?
Dr. Peter Marshall Gaines' NPI number is 1912915380. It was assigned on August 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Peter Marshall Gaines?
Dr. Peter Marshall Gaines is a family medicine physician in Atwater, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Peter Marshall Gaines practice?
Dr. Gaines practices at 1910 Customer Care Way, Atwater, CA 95301. Dr. Gaines' primary practice is GVHC - Atwater Administrative Offices in Atwater, California. Dmand AI also links Dr. Gaines to 1 community health center, 1 group practice or clinic and 1 medical group.
What is Dr. Peter Marshall Gaines' office phone number?
The practice phone on file for Dr. Gaines is (209) 384-6424.
What is Dr. Peter Marshall Gaines' medical license number?
Dr. Gaines holds California license G64747.
What medical group is Dr. Peter Marshall Gaines part of?
Dr. Gaines is linked to Golden Valley Health Centers. Dmand AI links Dr. Gaines to 1 more medical group.
Does Dr. Peter Marshall Gaines accept Medicare?
Yes. CMS data shows Dr. Gaines billed Medicare for 81 services in 2019, and Dr. Gaines accepts Medicare assignment.
What services does Dr. Peter Marshall Gaines bill to Medicare?
In 2019, Dr. Gaines' most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99222) and hospital inpatient care (99238).
What drugs does Dr. Peter Marshall Gaines prescribe most?
In 2023 Medicare Part D data, Dr. Gaines' most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Peter Marshall Gaines received payments from drug or device companies?
CMS Open Payments shows $98 in general payments to Dr. Gaines from 1 company from 2025 to 2025. The largest total came from Abbvie Inc.
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How long has Dr. Peter Marshall Gaines been practicing?
Dr. Gaines graduated from medical school in 1987, 39 years ago.
Does Dr. Peter Marshall Gaines do research?
Dmand AI links 2 publications to Dr. Gaines, published from 2014 to 2017.
Who does Dr. Peter Marshall Gaines publish with?
Dr. Gaines' most frequent co-authors are Stephanie Halene, MD (2 shared papers).
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