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Guy Mason Marshall, RD

  • Castle Pines, CO
  • Registered dietitian
NPI1982413597
Medical group
1
State license
1
Year NPI issued
2025
Practice address
1299 Sweet River Cir, Castle Pines, CO 80108
Professional email
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Personal email
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Mobile number
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Social profiles

Medical group

Fay Nutrition

San Francisco, California

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Guy Mason Marshall is a registered dietitian in Castle Pines, Colorado

Guy Marshall practices with Fay Nutrition, a medical group.

Guy Marshall's NPI, 1982413597, was assigned on January 7, 2025. Guy Marshall holds Colorado license 86290217.

NPI and contact details
NPI
1982413597NPI Registry (opens in a new tab)
NPI enumeration date
January 7, 2025
NPI status
Active
Professional email
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Personal email
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Mobile number
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Sex
Male

Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data

Guy Mason Marshall's practice address is in Castle Pines, Colorado

Guy Marshall's practice address in the NPI Registry is 1299 Sweet River Cir, Castle Pines, CO 80108.

  • NPI Registry address
    1299 Sweet River Cir, Castle Pines, CO 80108

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Guy Mason Marshall is affiliated with 1 medical group

Guy Marshall is part of Fay Nutrition, a medical group in San Francisco, California.

Source: Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Guy Mason Marshall's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Guy Marshall practices. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Fay NutritionAvailable with a free account

Source: Dmand AI Technology Install Data

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Guy Mason Marshall is one of 237 registered dietitians in Colorado

Dietitian, registered is Guy Marshall's primary specialty in the NPI Registry, under taxonomy code 133V00000X. Guy Marshall is licensed in Colorado.

Specialties and state licenses

  • Registered dietitian, ColoradoPrimaryLicense 86290217 · taxonomy 133V00000X

Registered dietitians near Guy Marshall

Counts of registered dietitians with a Dmand AI profile, by place and practice. Each opens the list.

237registered dietitians in Colorado2,018registered dietitians at Fay Nutrition

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Guy Mason Marshall's patients have a median age of 33

Across all payers, Dmand AI patient panel data puts Guy Marshall's median patient age at 33, with 100% women.

Guy Marshall's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 33

Patient panel by sex, all payers

  • Women100%
  • Men0%

Source: Dmand AI Patient Panel Data

Sources for Guy Mason Marshall's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemDmand AI Affiliation Data
Medicare patients and the all-payer patient panelDmand AI Patient Panel Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Guy Mason Marshall

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Guy Mason Marshall's NPI number?

Guy Mason Marshall's NPI number is 1982413597. It was assigned on January 7, 2025, and it is active in the NPI Registry.

What does Guy Mason Marshall specialize in?

Guy Mason Marshall is a registered dietitian in Castle Pines, Colorado. The primary specialty in the NPI Registry is Registered Dietitian (taxonomy code 133V00000X).

Where does Guy Mason Marshall practice?

Guy Marshall practices at 1299 Sweet River Cir, Castle Pines, CO 80108. Guy Marshall's primary practice is Fay Nutrition, a medical group.

What is Guy Mason Marshall's medical license number?

Guy Marshall holds Colorado license 86290217.

What medical group is Guy Mason Marshall part of?

Guy Marshall is part of Fay Nutrition in San Francisco, California.

How long has Guy Mason Marshall been practicing?

Guy Marshall's NPI was assigned in 2025.

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