DR. GREGORY JAMES BELLIG M.D.
NPI 1558354993
Anesthesiology in Danville, CA
About Dr. Gregory James Bellig M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GREGORY JAMES BELLIG M.D. (NPI 1558354993) is an individual anesthesiology provider in Danville, California, licensed in California (A81822) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS and is a graduate of Georgetown University School Of Medicine (1998).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Gregory James Bellig M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
7Medicare enrollment records show Gregory Bellig reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Ramon, CA 94583
- Reassigned Medicare billing, California enrollment
- 833 clinicians in this Medicare group
San Ramon, CA 94583
- Reassigned Medicare billing, California enrollment
- 176 clinicians in this Medicare group
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 723 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
Sacramento, CA 95821
- Reassigned Medicare billing, California enrollment
- 167 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gregory Bellig's NPI number?
The NPI number for Gregory Bellig is 1558354993. It was assigned to this individual provider in the NPPES registry on August 30, 2005.
Where is Gregory Bellig located?
Gregory Bellig practices at 567 Sycamore Valley Rd W, Danville, CA 94526. The listed phone number is (925) 272-9267.
What is Gregory Bellig's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Gregory Bellig enrolled in Medicare?
Yes. Gregory Bellig is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Gregory Bellig's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Bellig reassigns Medicare benefits to 7 organizations: Cep America - Anesthesia PC (San Ramon, CA), Premier Anesthesia Of California, PC (San Ramon, CA), John Muir Trauma Physicians Billing Service (Walnut Creek, CA), University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Bellig's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Gregory Bellig was last updated on September 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 56 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Gregory James Bellig, M.D. · NPI 1558354993
Anesthesiology physician in Danville, California. Individual provider, active in the CMS NPPES registry since August 30, 2005.
## Identity
- **NPI:** 1558354993 (Entity type: Individual)
- **Enumerated:** August 30, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A81822 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 567 SYCAMORE VALLEY RD W, Danville, CA 94526-3900
- **Phone:** (925) 272-9267
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Cep America - Anesthesia PC (NPI 1558043018, San Ramon, CA); Premier Anesthesia Of California, PC (NPI 1770691859, San Ramon, CA); John Muir Trauma Physicians Billing Service (NPI 1093864837, Walnut Creek, CA); University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Georgetown University School Of Medicine, class of 1998
## Record status
- **NPPES last updated:** September 20, 2026
- **Other identifiers:** Other CL390Z; Medicaid GR0028370 (CA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1558354993) · Data from the CMS NPPES public registry.