Mark K. Matthews, MD
Internal Medicine Physician · Denver, CO
Mark K. Matthews, MD is an internal medicine physician with a practice address in Denver, Colorado, and NPI 1467589499, issued on Feb 27, 2007. Check the license (Colorado 40845, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark K. Matthews
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 40845 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1375 E 20TH Ave, Denver, CO 80205
- Phone
- (303) 338-4545
- Enumerated
- Feb 27, 2007
- Record last updated
- Oct 11, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid ID
- 11274077 CO
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 1375 E 20TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Allen-Thomas, REGISTERED NURSERegistered Nurse1841327814
- Mana Amir, MDPulmonary Disease Physician1598731994
- Barbara Anderson, NPNurse Practitioner1962617076
- Sheri AndrusRegistered Nurse1750418638
- Sharisse Arnold Rehring, M.D.Pediatrics Physician1083741045
- Tyler Ashford, RNRegistered Nurse1568903383
Verify Mark K. Matthews in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 40845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
12 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Warfarin Sodium11 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.
Mark K. Matthews among 2,046 internal medicine physician records in Colorado
Mark K. Matthews, MD is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% 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 40% of them.
- NPI issued2007 · 40% of these records are older, 39% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2010 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
493 internal medicine physician records list a practice address in Denver
They are 493 of the 25,068 NPPES records with a practice address in Denver, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Denver → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jennifer Adams, MDDenver, CO 802051386663946
- Joshua Blum, M.D.Denver, CO 802051770526881
- Sarah Brodhead, MDDenver, CO 802051851438121
- Daniela Grayeb, MDDenver, CO 802051700852886
- Everette Jones, MDDenver, CO 802051376518522
- Cathie Korey, MDDenver, CO 802051962484253
- David LeonardDenver, CO 802051801823422
- Daniel Lewis, MDDenver, CO 802051598784985
Common questions
What is Mark K. Matthews, MD's NPI number?
Mark K. Matthews, MD's National Provider Identifier (NPI) is 1467589499, issued on Feb 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark K. Matthews, MD located?
The NPPES record lists a practice address at 1375 E 20TH Ave, Denver, CO, 80205. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Mark K. Matthews, MD's license?
NPPES lists Colorado license number 40845, 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 Mark K. Matthews, MD prescribe under Medicare Part D?
In 2024, Mark K. Matthews, MD had 12 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.