Dalton J. Mackay, MD
Family Medicine Physician · Castle Rock, CO
Dalton J. Mackay, MD is a family medicine physician with a practice address in Castle Rock, Colorado, and NPI 1801079488, issued on Dec 6, 2007. Check the license (Colorado 48378, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Dalton J. Mackay
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 48378 CO
25129 OK
Self-reported in NPPES; status is on the state search - Practice location
- 651 Topeka Way Ste 600, Castle Rock, CO 80109
- Phone
- (303) 728-9661
- Enumerated
- Dec 6, 2007
- Record last updated
- Feb 17, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (303) 728-9786
- Medicaid ID
- 91584078 CO
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Verify Dalton J. Mackay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 48378Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average family medicine physician in 2024
853 Medicare Part D claims for 65 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 45 claims were for opioids.
Most prescribed
- Mounjaro56 claims
- Levothyroxine Sodium49 claims
- Alprazolam27 claims
- Minoxidil27 claims
- Progesterone26 claims
- Rosuvastatin Calcium23 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.
Dalton J. Mackay among 3,563 family medicine physician records in Colorado
Dalton J. Mackay, MD 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 42% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2020 · 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
- Aaron Block, M.D., M.P.H.Castle Rock, CO 801091437578762
- Carla Bregni-Page, DOCastle Rock, CO 801091336139534
- Jennifer Daly, D.O.Castle Rock, CO 801091851656623
- Kristin Edwards, DOCastle Rock, CO 801091518607563
- Jodie Gahn-Stahley, PACastle Rock, CO 801091508012865
- Marco Gomez, MDCastle Rock, CO 801091811171572
- Brandon Stucky, MDCastle Rock, CO 801091841729217
- Francis Thompson, MDCastle Rock, CO 801091861640468
Common questions
What is Dalton J. Mackay, MD's NPI number?
Dalton J. Mackay, MD's National Provider Identifier (NPI) is 1801079488, issued on Dec 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Dalton J. Mackay, MD located?
The NPPES record lists a practice address at 651 Topeka Way Ste 600, Castle Rock, CO, 80109. Phone: (303) 728-9661. Providers update this record themselves, so call before visiting.
How can I verify Dalton J. Mackay, MD's license?
NPPES lists Colorado license number 48378, 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 Dalton J. Mackay, MD prescribe under Medicare Part D?
In 2024, Dalton J. Mackay, MD had 853 Medicare Part D claims for 65 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.