Dr. Gareth Thomas Marsh, DO
- Medicare services, 2024
- 161
- Medicare patients, 2024
- 42
- Part D claims, 2024
- 2,246
- MIPS score, 2024
- 87
- Hospital affiliations
- 2
- Practice address
- 9850 West St Lukes Drive, Nampa, ID 83687
- Practice phone
- Call (208) 505-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marsh's professional email, personal email and mobile number
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Dr. Gareth Thomas Marsh is a psychiatrist in Nampa, Idaho
Dr. Marsh practices at St. Luke's Nampa Medical Center in Nampa, Idaho, part of St. Luke's Health System.
Dr. Marsh's NPI, 1124558531, was assigned on June 18, 2017. Dr. Marsh holds Maryland license 2017020205.
- NPI
- 1124558531NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7719257716
- NPI enumeration date
- June 18, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (208) 505-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gareth Thomas Marsh practices at St. Luke's Nampa Medical Center in Nampa, Idaho
Dr. Marsh's primary practice is St. Luke's Nampa Medical Center, at 9850 West St Lukes Drive, Nampa, ID 83687 in Canyon County. The practice phone is (208) 505-2000.
- St. Luke's Nampa Medical Center9850 West St Lukes Drive, Nampa, ID 83687 · Canyon CountyPhone(208) 505-2000
Source: Dmand AI Affiliation Data
Dr. Gareth Thomas Marsh is affiliated with 2 sites of care and 1 medical group
Dr. Marsh's primary practice is St. Luke's Nampa Medical Center in Nampa, Idaho, part of St. Luke's Health System. Dr. Marsh is also affiliated with St. Luke's Boise Medical Center. The medical group on file is St. Luke's Health System.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gareth Thomas Marsh's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marsh practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Luke's Nampa Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gareth Thomas Marsh is one of 130 psychiatrists in Idaho
Psychiatry is Dr. Marsh's primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Marsh is licensed in Maryland.
Specialties and state licenses
- Psychiatry, MarylandPrimary
Psychiatrists near Dr. Marsh
Counts of psychiatrists 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
Dr. Gareth Thomas Marsh billed Medicare for 161 services in 2024
CMS data shows 161 Medicare services from Dr. Marsh across 2 procedure codes in 2024, all of them office visits, for 42 Medicare patients. Medicare paid $10,290 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Marsh's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1192024: 16135%
Dr. Marsh compared with the Idaho median for psychiatrists, 2024
- Dr. Marsh
- Idaho median
- Medicare services
- 161vs 14511% above
- Medicare patients
- 42vs 405% above
- Part D claims
- 2,049vs 8424.4 times
Medians across 122 psychiatrists in Idaho with Dmand AI profiles that report each measure.
Dr. Marsh's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gareth Thomas Marsh treated 42 Medicare patients in 2024, average age 59
CMS counts 42 Medicare patients who saw Dr. Marsh in 2024. The largest group is under 65, with 20 patients. 75% of them have anxiety, and 75% have mood disorders. 40% are also on Medicaid. Their average risk score is 1.34, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marsh's median patient age at 48, with 54% women.
Dr. Marsh's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marsh's Medicare patients by sex, 2024
- Women1945%
- Men2355%
Chronic conditions among Dr. Marsh's Medicare patients, 2024
- Anxiety75%
- Mood disorders75%
- High blood pressure71%
- Depression69%
- High cholesterol55%
- Arthritis43%
- Bipolar disorder38%
- Diabetes38%
Share of Medicare patients with each condition. A patient can have several.
Dr. 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 48
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gareth Thomas Marsh wrote 2,246 Medicare Part D claims in 2024
In 2024, Dr. Marsh wrote 2,246 Medicare Part D claims for 166 patients. 89% of them were for generic drugs. CMS names the drug for 2,049 of them, across 43 drugs with 11 or more claims each, at $248,075 in total drug cost. In 2023, CMS named 1,678 claims across 41 drugs.
Dr. Marsh's Part D claims by kind of drug, 2024
- Generic2,006 claims89%
- Brand-name240 claims11%
Dr. Marsh's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Marsh's Part D claims, 2024
- Antipsychotics, patients 65 and over4%96 of 2,246 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,6782024: 2,04922%
Drugs named by CMS: 43 in 2024, 41 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Gareth Thomas Marsh scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Marsh for performance year 2024, reported as part of a group. Dr. Marsh accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Marsh as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Marsh's MIPS scores, performance year 2024
- 87of 100Final score
- 81.3of 100Quality
- 100of 100Promoting Interoperability
- 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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Dr. Gareth Thomas Marsh received $220 in industry payments from 2019 to 2020
CMS Open Payments shows 15 general payments to Dr. Marsh from 4 drug and device companies from 2019 to 2020. Food and beverage make up the largest share, 100% of the total. Otsuka America Pharmaceutical, Inc. paid the most, $147.
General payments to Dr. Marsh by program year, 2019 to 2020
Companies that paid Dr. Marsh the most, 2019 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gareth Thomas 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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - 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) |
| 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 Dr. Gareth Thomas 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 Dr. Gareth Thomas Marsh's NPI number?
Dr. Gareth Thomas Marsh's NPI number is 1124558531. It was assigned on June 18, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Gareth Thomas Marsh?
Dr. Gareth Thomas Marsh is a psychiatrist in Nampa, Idaho. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Gareth Thomas Marsh practice?
Dr. Marsh practices at 9850 West St Lukes Drive, Nampa, ID 83687. Dr. Marsh's primary practice is St. Luke's Nampa Medical Center in Nampa, Idaho, part of St. Luke's Health System.
What is Dr. Gareth Thomas Marsh's office phone number?
The practice phone on file for Dr. Marsh is (208) 505-2000.
What is Dr. Gareth Thomas Marsh's medical license number?
Dr. Marsh holds Maryland license 2017020205.
Which hospitals is Dr. Gareth Thomas Marsh affiliated with?
Dr. Marsh practices at St. Luke's Nampa Medical Center in Nampa, Idaho. Dr. Marsh is also affiliated with St. Luke's Boise Medical Center.
What medical group is Dr. Gareth Thomas Marsh part of?
Dr. Marsh is linked to St. Luke's Health System.
Does Dr. Gareth Thomas Marsh accept Medicare?
Yes. CMS data shows Dr. Marsh billed Medicare for 161 services in 2024, and Dr. Marsh accepts Medicare assignment.
Does Dr. Gareth Thomas Marsh offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Marsh as offering telehealth services.
What is Dr. Gareth Thomas Marsh's MIPS score?
Dr. Marsh's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Gareth Thomas Marsh see?
CMS counts 42 Medicare patients who saw Dr. Marsh in 2024, with an average age of 59.
What services does Dr. Gareth Thomas Marsh bill to Medicare?
In 2024, Dr. Marsh's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
What drugs does Dr. Gareth Thomas Marsh prescribe most?
In 2024 Medicare Part D data, Dr. Marsh's most prescribed drugs by claims were Lorazepam, Buspirone HCl and Trazodone HCl.
Has Dr. Gareth Thomas Marsh received payments from drug or device companies?
CMS Open Payments shows $220 in general payments to Dr. Marsh from 4 companies from 2019 to 2020. The largest total came from Otsuka America Pharmaceutical, Inc.
How long has Dr. Gareth Thomas Marsh been practicing?
Dr. Marsh graduated from medical school in 2017, 9 years ago.
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