Mark A. Twardowski, DO
Family Medicine Physician · Grand Junction, CO
Mark A. Twardowski, DO is a family medicine physician with a practice address in Grand Junction, Colorado, and NPI 1437118387, issued on Mar 20, 2006. Check the license (Colorado 31690, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark A. Twardowski
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 31690 CO
Self-reported in NPPES; status is on the state search - Practice location
- 743 Horizon CT, Grand Junction, CO 81506
- Phone
- (970) 241-7600
- Enumerated
- Mar 20, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (970) 263-4831
- Medicaid ID
- 1316900 CO
- Medicare enrollment
- Enrolled (PECOS I20090605000191); accepts Medicare assignment
- Medical or professional school
- Kansas City Medical College, 1988
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Also registered at 743 Horizon CT
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Thomas Moore, DOFamily Medicine Physician1699734418
- Sylvia Saunders, RN MSN FNPFamily Nurse Practitioner1043287139
- Deborah Twardowski, RN MSN CSAdult Health Nurse Practitioner1720055890
Verify Mark A. Twardowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 31690Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average family medicine physician in 2024
7,153 Medicare Part D claims for 462 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 132 claims were for opioids.
Most prescribed
- Atorvastatin Calcium594 claims
- Lisinopril475 claims
- Levothyroxine Sodium332 claims
- Amlodipine Besylate324 claims
- Tamsulosin Hcl224 claims
- Metformin Hcl209 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.
Bills Medicare through one group practice
- Community Medical Group LLCGrand Junction, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark A. Twardowski among 3,563 family medicine physician records in Colorado
Mark A. Twardowski, 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 56% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1988 · median 2008 among the 2,077 with a school on file
- Record last updated2023 · 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).
135 family medicine physician records list a practice address in Grand Junction
They are 135 of the 3,482 NPPES records with a practice address in Grand Junction, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Grand Junction → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- David Dirks, MDGrand Junction, CO 815061871576561
- Jill Hilty, MDGrand Junction, CO 815061225011943
- Shannon Keel, M.D.Grand Junction, CO 815061558351940
- Glenn Madrid, MDGrand Junction, CO 815061982687620
- Mark Madsen, MDGrand Junction, CO 815061093798738
- Andrew Mohler, MDGrand Junction, CO 815061790768430
- Philip Mohler, MDGrand Junction, CO 815061437132172
- Michael Pramenko, MDGrand Junction, CO 815061619950201
Common questions
What is Mark A. Twardowski, DO's NPI number?
Mark A. Twardowski, DO's National Provider Identifier (NPI) is 1437118387, issued on Mar 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark A. Twardowski, DO located?
The NPPES record lists a practice address at 743 Horizon CT, Grand Junction, CO, 81506. Phone: (970) 241-7600. Providers update this record themselves, so call before visiting.
How can I verify Mark A. Twardowski, DO's license?
NPPES lists Colorado license number 31690, 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 A. Twardowski, DO prescribe under Medicare Part D?
In 2024, Mark A. Twardowski, DO had 7,153 Medicare Part D claims for 462 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.