Infect Control Hosp Epidemiol
COVID-19Cross InfectionHealth Personnel
Dr. Gregory Yervant Warner, DO
NPI1073704326PAC ID8628131281
- Medicare services, 2024
- 965
- Medicare patients, 2024
- 317
- Part D claims, 2024
- 836
- Publications
- 2
- Hospital affiliations
- 2
- Practice address
- 1200 B Gale Wilson Blvd, Fairfield, CA 94533
- Practice phone
- Call (707) 646-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Warner'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. Gregory Yervant Warner is an infectious disease specialist in Fairfield, California
Dr. Warner practices at NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare.
Dr. Warner's NPI, 1073704326, was assigned on August 1, 2007. Dr. Warner graduated from WesternU College of Osteopathic Medicine of the Pacific in 2005. Dr. Warner holds California license 20A9902.
NPI and contact details
- NPI
- 1073704326NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8628131281
- NPI enumeration date
- August 1, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (707) 646-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Yervant Warner practices at NorthBay Medical Center in Fairfield, California
Dr. Warner's primary practice is NorthBay Medical Center, at 1200 B Gale Wilson Blvd, Fairfield, CA 94533 in Solano County. The practice phone is (707) 646-5000.
- NorthBay Medical Center1200 B Gale Wilson Blvd, Fairfield, CA 94533 · Solano CountyPhone(707) 646-5000
Source: Dmand AI Affiliation Data
Dr. Gregory Yervant Warner is affiliated with 5 sites of care and 2 medical groups
Dr. Warner's primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. Dr. Warner is also affiliated with Sutter Medical Center, Sacramento. The medical group on file is NorthBay Medical Center. Dmand AI also links Dr. Warner to 2 more group practices and clinics, 1 home health agency and 1 medical group, each named with a free account.
Sutter Medical Center, SacramentoNorthBay Medical Center2 group practices and clinicsNames with a free account1 home health agencyName with a free account1 medical groupName with a free account
See all 7 affiliations for Dr. WarnerSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory Yervant Warner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Warner practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| NorthBay Medical Center | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Gregory Yervant Warner is one of 1,054 infectious disease specialists in California
Infectious disease is Dr. Warner's primary specialty in the NPI Registry, under taxonomy code 207RI0200X. Dr. Warner is board certified in infectious disease by the American Board of Internal Medicine. Dr. Warner is licensed in California.
Specialties and state licenses
- Infectious disease, CaliforniaPrimary
Clinical focus
Dmand AI lists acute skin infection, cold sores or genital herpes, hiv/aids, joint or bone infection, pneumonia, shingles, UTI and yeast infection among the conditions Dr. Warner treats.
Infectious disease specialists near Dr. Warner
Counts of infectious disease specialists with a Dmand AI profile, by place and practice. Each opens the list.
1,054infectious disease specialists in California
6infectious disease specialists in Fairfield
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory Yervant Warner billed Medicare for 965 services in 2024
CMS data shows 965 Medicare services from Dr. Warner across 4 procedure codes in 2024, for 317 Medicare patients. Medicare paid $100,593 for them.
Medicare services, 2024965
Medicare patients317
Paid by Medicare$100,593
Procedure codes4
Dr. Warner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 9292024: 9654%
Where Dr. Warner's Medicare services took place, 2024
- In an office20621%
- In a facility75979%
Dr. Warner compared with the California median for infectious disease specialists, 2024
- Dr. Warner
- California median
- Medicare services
- 965vs 4292.2 times
- Medicare patients
- 317vs 18076% above
- Part D claims
- 645vs 1195.4 times
Medians across 930 infectious disease specialists in California with Dmand AI profiles that report each measure.
Dr. Warner'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.
Need commercial claims for Dr. Warner?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Warner and other infectious disease specialists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Yervant Warner treated 317 Medicare patients in 2024, average age 71
CMS counts 317 Medicare patients who saw Dr. Warner in 2024. The largest group is 65 to 74, with 117 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 58% are also on Medicaid. Their average risk score is 3.14, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Warner's median patient age at 58, with 40% women.
Medicare patients, 2024317
Average age71
Average risk score3.14
Also on Medicaid58%
Dr. Warner's Medicare patients by age, 2024
Dr. Warner's Medicare patients by sex, 2024
- Women15649%
- Men16151%
Chronic conditions among Dr. Warner's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Chronic kidney disease53%
- Diabetes53%
- Mood disorders49%
- Depression44%
- Ischemic heart disease43%
Share of Medicare patients with each condition. A patient can have several.
Dr. Warner'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
- Women40%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Yervant Warner wrote 836 Medicare Part D claims in 2024
In 2024, Dr. Warner wrote 836 Medicare Part D claims for 133 patients. 67% of them were for generic drugs. CMS names the drug for 645 of them, across 25 drugs with 11 or more claims each, at $1,082,197 in total drug cost. In 2023, CMS named 770 claims across 31 drugs.
Part D claims, 2024836
Drugs named by CMS25
Total drug cost$1.1M
Part D patients133
Dr. Warner's Part D claims by kind of drug, 2024
- Generic559 claims67%
- Brand-name277 claims33%
Dr. Warner'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. Warner's Part D claims, 2024
- Antibiotics47%392 of 836 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: 7702024: 64516%
Drugs named by CMS: 25 in 2024, 31 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. Gregory Yervant Warner offers telehealth to Medicare patients
Dr. Warner accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Warner as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory Yervant Warner has 2 publications on record
Dmand AI links 2 papers to Dr. Warner in 2020. Dr. Warner's most frequent co-authors are Stuart H. Cohen, MD, Hien Huy Nguyen, MD and Minh Hiep Nguyen, MD.
Papers2
Dr. Warner's most frequent co-authors
- Stuart H. Cohen, MD1 shared paper
- Hien Huy Nguyen, MD1 shared paper
- Minh Hiep Nguyen, MD1 shared paper
Recent publications by Dr. Warner
J Expo Anal Environ Epidemiol
Air PollutantsAir Pollution, IndoorAsthma
See who Dr. Warner researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Warner works with, so you can find a warm path to the right infectious disease specialists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory Yervant Warner received $826 in industry payments from 2017 to 2025
CMS Open Payments shows 35 general payments to Dr. Warner from 18 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 92% of the total. ViiV Healthcare Company paid the most, $98.
General payments to Dr. Warner by program year, 2017 to 2025
General payments to Dr. Warner by kind, 2017 to 2025
$826in total
- Food and beverage$75692%
- Education$708%
Companies that paid Dr. Warner the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory Yervant Warner graduated from WesternU College of Osteopathic Medicine of the Pacific
Dr. Warner graduated from WesternU College of Osteopathic Medicine of the Pacific in 2005. Dr. Warner is a member of ACP and IDSA.
- Medical school
- Board certified in infectious disease
Source: Dmand AI Professional Profile Data
Dr. Gregory Yervant Warner accepts plans from 13 insurance carriers
Dr. Warner is in network with 13 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- United Healthcare
- Alliant Health Plans
- +5 more carriersWith a free account
Plan types Dr. Warner accepts, by number of carriers
- Medicare8
- PPO7
- HMO6
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory Yervant Warner'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 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 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 | 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) |
| 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. Gregory Yervant Warner
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. Gregory Yervant Warner's NPI number?
Dr. Gregory Yervant Warner's NPI number is 1073704326. It was assigned on August 1, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Yervant Warner?
Dr. Gregory Yervant Warner is an infectious disease specialist in Fairfield, California. The primary specialty in the NPI Registry is Infectious Disease Physician (taxonomy code 207RI0200X).
Where does Dr. Gregory Yervant Warner practice?
Dr. Warner practices at 1200 B Gale Wilson Blvd, Fairfield, CA 94533. Dr. Warner's primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. Dmand AI also links Dr. Warner to 2 group practices and clinics, 1 home health agency and 1 medical group.
What is Dr. Gregory Yervant Warner's office phone number?
The practice phone on file for Dr. Warner is (707) 646-5000.
What is Dr. Gregory Yervant Warner's medical license number?
Dr. Warner holds California license 20A9902.
Which hospitals is Dr. Gregory Yervant Warner affiliated with?
Dr. Warner practices at NorthBay Medical Center in Fairfield, California. Dr. Warner is also affiliated with Sutter Medical Center, Sacramento.
What medical group is Dr. Gregory Yervant Warner part of?
Dr. Warner is linked to NorthBay Medical Center. Dmand AI links Dr. Warner to 1 more medical group.
Does Dr. Gregory Yervant Warner accept Medicare?
Yes. CMS data shows Dr. Warner billed Medicare for 965 services in 2024, and Dr. Warner accepts Medicare assignment.
Does Dr. Gregory Yervant Warner offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Warner as offering telehealth services.
How many Medicare patients does Dr. Gregory Yervant Warner see?
CMS counts 317 Medicare patients who saw Dr. Warner in 2024, with an average age of 71.
Show 9 more questionsShow fewer questions
Is Dr. Gregory Yervant Warner board certified?
Yes. Dr. Warner is board certified in infectious disease by the American Board of Internal Medicine.
What services does Dr. Gregory Yervant Warner bill to Medicare?
In 2024, Dr. Warner's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99223) and office visit, established patient (99215).
Where did Dr. Gregory Yervant Warner go to medical school?
Dr. Warner graduated from WesternU College of Osteopathic Medicine of the Pacific in 2005.
What drugs does Dr. Gregory Yervant Warner prescribe most?
In 2024 Medicare Part D data, Dr. Warner's most prescribed drugs by claims were Biktarvy, Cephalexin and Daptomycin.
Has Dr. Gregory Yervant Warner received payments from drug or device companies?
CMS Open Payments shows $826 in general payments to Dr. Warner from 18 companies from 2017 to 2025. The largest total came from ViiV Healthcare Company.
How long has Dr. Gregory Yervant Warner been practicing?
Dr. Warner graduated from medical school in 2005, 21 years ago.
Does Dr. Gregory Yervant Warner do research?
Dmand AI links 2 publications to Dr. Warner.
Who does Dr. Gregory Yervant Warner publish with?
Dr. Warner's most frequent co-authors are Stuart H. Cohen, MD (1 shared paper), Hien Huy Nguyen, MD (1 shared paper) and Minh Hiep Nguyen, MD (1 shared paper).
What insurance does Dr. Gregory Yervant Warner accept?
Dr. Warner is in network with 13 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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