Gregory B. Marsh
- Medicare services, 2021
- 27
- Medicare patients, 2024
- 19
- MIPS score, 2024
- 82
- Industry payments
- $123
- Affiliated sites
- 1
- Practice address
- 747 Broadway, Seattle, WA 98122
- Practice phone
- Call (206) 386-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Swedish Medical Center -First Hill
Seattle, Washington
Find Gregory Marsh'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.
Gregory B. Marsh is an anesthesiologist in Seattle, Washington
Gregory Marsh practices at Swedish Medical Center -First Hill in Seattle, Washington.
Gregory Marsh's NPI, 1114952009, was assigned on July 11, 2006. Gregory Marsh graduated from University of Washington School of Medicine in 1988. Gregory Marsh holds Washington license MD00029703.
- NPI
- 1114952009NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072606904
- NPI enumeration date
- July 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (206) 386-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Gregory B. Marsh practices at Swedish Medical Center -First Hill in Seattle, Washington
Gregory Marsh's primary practice is Swedish Medical Center -First Hill, at 747 Broadway, Seattle, WA 98122 in King County. The practice phone is (206) 386-6000.
- Swedish Medical Center -First Hill747 Broadway, Seattle, WA 98122 · King CountyPhone(206) 386-6000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Gregory B. Marsh is affiliated with 2 sites of care and 1 medical group
Gregory Marsh's primary practice is Swedish Medical Center -First Hill in Seattle, Washington. The medical group on file is U.S. Anesthesia Partners of Washington. Dmand AI also links Gregory Marsh to 1 more group practice or clinic, 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 Gregory B. Marsh's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gregory Marsh practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Swedish Medical Center -First Hill | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Gregory B. Marsh is one of 1,332 anesthesiologists in Washington
Anesthesiology is Gregory Marsh's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Gregory Marsh is licensed in Washington.
Specialties and state licenses
- Anesthesiology, WashingtonPrimary
Anesthesiologists near Gregory Marsh
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
Gregory B. Marsh billed Medicare for 27 services in 2021
CMS data shows 27 Medicare services from Gregory Marsh across 2 procedure codes in 2021, for 19 Medicare patients. Medicare paid $3,297 for them. Every service was in a facility, such as a hospital, rather than an office.
Gregory Marsh's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Anesthesia
- 2020: 382021: 2729%
Gregory Marsh compared with the Washington median for anesthesiologists, 2021
- Gregory Marsh
- Washington median
- Medicare services
- 27vs 4134% below
- Medicare patients
- 19vs 10782% below
Medians across 1,312 anesthesiologists in Washington with Dmand AI profiles that report each measure.
Gregory Marsh's most billed Medicare procedure codes, 2021
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 Gregory Marsh?
Medicare shows one payer. Book a meeting to get commercial claims data for Gregory Marsh and other anesthesiologists in Washington.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Gregory B. Marsh treated 19 Medicare patients in 2024, average age 72
CMS counts 19 Medicare patients who saw Gregory Marsh in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 2.29, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Gregory Marsh's median patient age at 56, with 25% women.
Chronic conditions among Gregory Marsh's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
Share of Medicare patients with each condition. A patient can have several.
Gregory Marsh's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women25%
- Men75%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Gregory B. Marsh scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Gregory Marsh for performance year 2024, reported as part of a group. Gregory Marsh accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Gregory Marsh's MIPS scores, performance year 2024
- 82of 100Final score
- 80.9of 100Quality
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Gregory B. Marsh received $123 in industry payments in 2017
CMS Open Payments shows 1 general payment to Gregory Marsh from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Halyard Health, Inc. paid the most, $123.
Companies that paid Gregory Marsh the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Gregory B. Marsh graduated from University of Washington School of Medicine
Gregory Marsh graduated from University of Washington School of Medicine in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Gregory B. Marsh'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)Clinician Public Reporting: Overall MIPS Performance (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 Gregory B. Marsh
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Gregory B. Marsh's NPI number?
Gregory B. Marsh's NPI number is 1114952009. It was assigned on July 11, 2006, and it is active in the NPI Registry.
What does Gregory B. Marsh specialize in?
Gregory B. Marsh is an anesthesiologist in Seattle, Washington. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Gregory B. Marsh practice?
Gregory Marsh practices at 747 Broadway, Seattle, WA 98122. Gregory Marsh's primary practice is Swedish Medical Center -First Hill in Seattle, Washington. Dmand AI also links Gregory Marsh to 1 group practice or clinic.
What is Gregory B. Marsh's office phone number?
The practice phone on file for Gregory Marsh is (206) 386-6000.
What is Gregory B. Marsh's medical license number?
Gregory Marsh holds Washington license MD00029703.
What medical group is Gregory B. Marsh part of?
Gregory Marsh is linked to U.S. Anesthesia Partners of Washington.
Does Gregory B. Marsh accept Medicare?
Yes. CMS data shows Gregory Marsh billed Medicare for 27 services in 2021, and Gregory Marsh accepts Medicare assignment.
What is Gregory B. Marsh's MIPS score?
Gregory Marsh's MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
How many Medicare patients does Gregory B. Marsh see?
CMS counts 19 Medicare patients who saw Gregory Marsh in 2024, with an average age of 72.
What services does Gregory B. Marsh bill to Medicare?
In 2021, Gregory Marsh's most billed Medicare services were anesthesia (00811) and anesthesia (00731).
Show 3 more questionsShow fewer questions
Where did Gregory B. Marsh go to medical school?
Gregory Marsh graduated from University of Washington School of Medicine in 1988.
Has Gregory B. Marsh received payments from drug or device companies?
CMS Open Payments shows $123 in general payments to Gregory Marsh from 1 company from 2017 to 2017. The largest total came from Halyard Health, Inc.
How long has Gregory B. Marsh been practicing?
Gregory Marsh graduated from medical school in 1988, 38 years ago.
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