Dr. Gregory James Bellig, MD
- Medicare services, 2023
- 53
- Medicare patients, 2024
- 77
- Hospital affiliations
- 2
- Industry payments
- $49
- Medical groups
- 7
- Practice address
- 460 N Wiget Ln, Walnut Creek, CA 94598
- Practice phone
- Call (202) 815-3665
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Bay Area Surgical Specialist Services
Walnut Creek, California
Find Dr. Bellig'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 James Bellig is an anesthesiologist in Walnut Creek, California
Dr. Bellig practices at Bay Area Surgical Specialist Services in Walnut Creek, California.
Dr. Bellig's NPI, 1558354993, was assigned on August 30, 2005. Dr. Bellig graduated from Georgetown University School of Medicine in 1998. Dr. Bellig holds California license A81822.
- NPI
- 1558354993NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0345230215
- NPI enumeration date
- August 30, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (202) 815-3665
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory James Bellig practices at Bay Area Surgical Specialist Services in Walnut Creek, California
Dr. Bellig's primary practice is Bay Area Surgical Specialist Services, at 460 N Wiget Ln, Walnut Creek, CA 94598 in Contra Costa County. The practice phone is (202) 815-3665.
- Bay Area Surgical Specialist Services460 N Wiget Ln, Walnut Creek, CA 94598 · Contra Costa CountyPhone(202) 815-3665
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory James Bellig is affiliated with 4 sites of care and 7 medical groups
Dr. Bellig's primary practice is Bay Area Surgical Specialist Services in Walnut Creek, California. Dr. Bellig is also affiliated with John Muir Medical Center, Walnut Creek. The medical group on file is UCSF Medical Group. Dmand AI also links Dr. Bellig to 1 more hospital, 6 medical groups and 1 group practice or clinic, each 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. Gregory James Bellig's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Bellig practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Bay Area Surgical Specialist Services | Available with a free account |
| +3 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory James Bellig is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Bellig's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dmand AI has Dr. Bellig's licenses on file in 3 states: California, Michigan and Pennsylvania.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
- Michigan license
- Pediatric anesthesiology, Pennsylvania
Anesthesiologists near Dr. Bellig
Counts of anesthesiologists 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. Gregory James Bellig billed Medicare for 53 services in 2023
CMS data shows 53 Medicare services from Dr. Bellig across 3 procedure codes in 2023, for 77 Medicare patients. Medicare paid $7,975 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Bellig's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Anesthesia
- 2022: 1512023: 5365%
- Imaging
- 2022: 192023: 0100%
- Surgery
- 2022: 162023: 0100%
Dr. Bellig compared with the California median for anesthesiologists, 2023
- Dr. Bellig
- California median
- Medicare services
- 53vs 7226% below
- Medicare patients
- 77vs 14346% below
Medians across 5,562 anesthesiologists in California with Dmand AI profiles that report each measure.
Dr. Bellig's most billed Medicare procedure codes, 2023
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. Bellig?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Bellig and other anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory James Bellig treated 77 Medicare patients in 2024, average age 76
CMS counts 77 Medicare patients who saw Dr. Bellig in 2024. The largest group is 75 to 84, with 31 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 23% are also on Medicaid. Their average risk score is 1.43, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Bellig's median patient age at 9, with 34% women.
Dr. Bellig's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Bellig's Medicare patients by sex, 2024
- Women4052%
- Men3748%
Chronic conditions among Dr. Bellig's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Cancer36%
- Chronic kidney disease35%
- Ischemic heart disease32%
- Anxiety29%
- Diabetes26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Bellig's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 9
Patient panel by sex, all payers
- Women34%
- Men64%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Gregory James Bellig takes part in Medicare
Dr. Bellig 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. Gregory James Bellig received $49 in industry payments in 2021
CMS Open Payments shows 1 general payment to Dr. Bellig from 1 drug or device company in 2021. Food and beverage make up the largest share, 100% of the total. Acacia Pharma Inc paid the most, $49.
Companies that paid Dr. Bellig the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory James Bellig graduated from Georgetown University School of Medicine
Dr. Bellig graduated from Georgetown University School of Medicine in 1998.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory James Bellig'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) |
| 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 |
| 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 James Bellig
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 James Bellig's NPI number?
Dr. Gregory James Bellig's NPI number is 1558354993. It was assigned on August 30, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory James Bellig?
Dr. Gregory James Bellig is an anesthesiologist in Walnut Creek, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Gregory James Bellig practice?
Dr. Bellig practices at 460 N Wiget Ln, Walnut Creek, CA 94598. Dr. Bellig's primary practice is Bay Area Surgical Specialist Services in Walnut Creek, California. Dmand AI also links Dr. Bellig to 1 hospital, 6 medical groups and 1 group practice or clinic.
What is Dr. Gregory James Bellig's office phone number?
The practice phone on file for Dr. Bellig is (202) 815-3665.
What is Dr. Gregory James Bellig's medical license number?
Dr. Bellig holds California license A81822, one of the licenses on file in 3 states.
Which states has Dr. Gregory James Bellig been licensed in?
Dmand AI has state licenses on file for Dr. Bellig in California, Michigan and Pennsylvania.
Which hospitals is Dr. Gregory James Bellig affiliated with?
Dr. Bellig is affiliated with John Muir Medical Center, Walnut Creek. Dmand AI links Dr. Bellig to 1 more hospital.
What medical group is Dr. Gregory James Bellig part of?
Dr. Bellig is linked to UCSF Medical Group. Dmand AI links Dr. Bellig to 6 more medical groups.
Does Dr. Gregory James Bellig accept Medicare?
Yes. CMS data shows Dr. Bellig billed Medicare for 53 services in 2023, and Dr. Bellig accepts Medicare assignment.
How many Medicare patients does Dr. Gregory James Bellig see?
CMS counts 77 Medicare patients who saw Dr. Bellig in 2024, with an average age of 76.
Show 4 more questionsShow fewer questions
What services does Dr. Gregory James Bellig bill to Medicare?
In 2023, Dr. Bellig's most billed Medicare services were anesthesia (00731), anesthesia (00811) and anesthesia (01922).
Where did Dr. Gregory James Bellig go to medical school?
Dr. Bellig graduated from Georgetown University School of Medicine in 1998.
Has Dr. Gregory James Bellig received payments from drug or device companies?
CMS Open Payments shows $49 in general payments to Dr. Bellig from 1 company from 2021 to 2021. The largest total came from Acacia Pharma Inc.
How long has Dr. Gregory James Bellig been practicing?
Dr. Bellig graduated from medical school in 1998, 28 years ago.
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