Grant Hayes Thomas, DO
Family Medicine Physician · Castle Rock, CO
Grant Hayes Thomas, DO is a family medicine physician with a practice address in Castle Rock, Colorado, and NPI 1972253169, issued on Mar 28, 2022. Check the license (Colorado DR.0074262, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Grant Hayes Thomas
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- DR.0074262 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4318 Trail Boss Dr, Castle Rock, CO 80104
- Phone
- (303) 338-4545
- Enumerated
- Mar 28, 2022
- Record last updated
- Aug 29, 2025
- Medicaid ID
- 9000207700 CO
- Medicare enrollment
- Enrolled (PECOS I20250911003208); accepts Medicare assignment
- Medical or professional school
- Campbell Univ School Of Osteopathic Medicine, 2022
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Also registered at 4318 Trail Boss Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Grant Hayes Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0074262Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average family medicine physician in 2024
668 Medicare Part D claims for 109 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium56 claims
- Metformin Hcl47 claims
- Lisinopril35 claims
- Omeprazole28 claims
- Amlodipine Besylate21 claims
- Prednisone21 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $132.06
2 payments; by number, the most common kind was food and beverage; the largest payer was Zimmer Biomet Holdings, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Colorado Permanente Medical Group PCCastle Rock, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Grant Hayes Thomas among 3,563 family medicine physician records in Colorado
Grant Hayes Thomas, DO is one of 3,563 family medicine physician records with a practice address in Colorado. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 95% of them.
- NPI issued2022 · 95% of these records are older, 3% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2022 · median 2008 among the 2,077 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
45 family medicine physician records list a practice address in Castle Rock
They are 45 of the 1,319 NPPES records with a practice address in Castle Rock, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Castle Rock → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- John Campbell, M.D.Castle Rock, CO 801041053373415
- Christopher Carpenter, M.D.Castle Rock, CO 801041508846023
- Ann Engel, M.D.Castle Rock, CO 801041285743385
- Jack England, D.O.Castle Rock, CO 801041609856749
- Deborah Fromm, MDCastle Rock, CO 801041467492090
- Belton Hallmark, M.D.Castle Rock, CO 801041225018633
- Louis Kasunic, D.O.Castle Rock, CO 801041912083296
- Doris Kleinert, M.D.Castle Rock, CO 801041861474751
Common questions
What is Grant Hayes Thomas, DO's NPI number?
Grant Hayes Thomas, DO's National Provider Identifier (NPI) is 1972253169, issued on Mar 28, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Grant Hayes Thomas, DO located?
The NPPES record lists a practice address at 4318 Trail Boss Dr, Castle Rock, CO, 80104. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Grant Hayes Thomas, DO's license?
NPPES lists Colorado license number DR.0074262, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Grant Hayes Thomas, DO prescribe under Medicare Part D?
In 2024, Grant Hayes Thomas, DO had 668 Medicare Part D claims for 109 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.