DR. COLBY C GRAY D.O.
NPI 1326428509
Anesthesiology in Boston, MA
About Dr. Colby C Gray D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. COLBY C GRAY D.O. (NPI 1326428509) is an individual anesthesiology provider in Boston, Massachusetts, licensed in Massachusetts (1013031) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, is affiliated with St Elizabeth's Medical Center, and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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. Colby C Gray D.o. 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
4Medicare enrollment records show Colby Gray reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 clinicians in this Medicare group
Boston, MA 02118
- Reassigned Medicare billing, Massachusetts enrollment
- 716 clinicians in this Medicare group
Fall River, MA 02721
- Reassigned Medicare billing, Massachusetts enrollment
- 347 clinicians in this Medicare group
Phoenix, AZ 85024
- Reassigned Medicare billing, Arizona enrollment
- 518 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Elizabeth's Medical Center
Acute Care Hospitals · Brighton, MABrigham And Women's Hospital
Acute Care Hospitals · Boston, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Colby Gray's NPI number?
The NPI number for Colby Gray is 1326428509. It was assigned to this individual provider in the NPPES registry on June 3, 2015.
Where is Colby Gray located?
Colby Gray practices at 75 Francis St, Boston, MA 02115. The listed phone number is (617) 732-8210.
What is Colby Gray's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Colby Gray enrolled in Medicare?
Yes. Colby Gray 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 Colby Gray's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Colby Gray reassigns Medicare benefits to 4 organizations: Brigham & Womens Physicians Organization Inc (Boston, MA), Bmc Affiliated Physicians, Inc. (Boston, MA), Steward Medical Group, Inc (Fall River, MA) and Valley Anesthesiology Consultants, Inc. (Phoenix, AZ). 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 Colby Gray's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Colby Gray accept?
Health plans from Blue Cross Blue Shield of Arizona, Oscar Health Plan, Inc., Taro Health and WellSense Health Plan list Colby Gray as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Colby Gray affiliated with any hospitals?
According to CMS data, Colby Gray is affiliated with St Elizabeth's Medical Center and Brigham And Women's Hospital.
When was this NPI record last updated?
The NPPES record for Colby Gray was last updated on October 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months 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. Colby C Gray, D.O. · NPI 1326428509
Anesthesiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since June 3, 2015.
## Identity
- **NPI:** 1326428509 (Entity type: Individual)
- **Enumerated:** June 3, 2015
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 1013031 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 75 FRANCIS ST, Boston, MA 02115-6110
- **Phone:** (617) 732-8210
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA); Bmc Affiliated Physicians, Inc. (NPI 1245320910, Boston, MA); Steward Medical Group, Inc (NPI 1043711914, Fall River, MA); Valley Anesthesiology Consultants, Inc. (NPI 1285660704, Phoenix, AZ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** October 20, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1326428509) · Data from the CMS NPPES public registry.