Gregory Marsh
NPI 1114952009 · Anesthesiology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Marsh is a Anesthesiology Physician provider in Seattle, WA (NPI 1114952009).
Provider details
- NPI number
- 1114952009
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- MD00029703 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2008-04-15
Frequently asked questions
- What is Gregory Marsh's NPI number?
- Gregory Marsh's National Provider Identifier (NPI) is 1114952009, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Marsh's specialty?
- Gregory Marsh is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Marsh located?
- Gregory Marsh's practice location on file with NPPES is 1229 Madison St, Seattle, WA 98104-3586.
- What is Gregory Marsh's phone number?
- The practice phone number listed in the NPPES registry for Gregory Marsh is (206) 625-0578.
- Does Gregory Marsh accept Medicare?
- Gregory Marsh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Marsh's NPI active?
- Yes — Gregory Marsh's NPI (1114952009) is active in the NPPES registry as of the last update on 2008-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.