Grace Ellen Marx, M.D.
Infectious Disease Physician · Denver, CO
Grace Ellen Marx, M.D. is an infectious disease physician with a practice address in Denver, Colorado, and NPI 1144545799, issued on Apr 6, 2010. Check the license (Colorado 52448, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Grace Ellen Marx
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 52448 CO
Self-reported in NPPES; status is on the state search - Practice location
- 605 Bannock St, Denver, CO 80204
- Phone
- (303) 602-8736
- Enumerated
- Apr 6, 2010
- Record last updated
- Mar 2, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140627001775); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 182 in Colorado → Look up another NPI →
Also registered at 605 Bannock St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Nora Helmus, LCSWClinical Social Worker1013351683
- Robin List, LCSWClinical Social Worker1609157270
- Donna Lopez, LPNLicensed Practical Nurse1366686917
- Lori Nelson, LPNLicensed Practical Nurse1215171533
Verify Grace Ellen Marx in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 52448Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average infectious disease physician in 2024
232 Medicare Part D claims, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Biktarvy54 claims
- Duloxetine Hcl16 claims
- Lisinopril14 claims
- Amlodipine Besylate13 claims
- Atorvastatin Calcium13 claims
- Lorazepam12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 91.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Denver Health And Hospital AuthorityDenver, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Grace Ellen Marx among 182 infectious disease physician records in Colorado
Grace Ellen Marx, M.D. is one of 182 infectious disease physician records with a practice address in Colorado. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 72% of them.
- NPI issued2010 · 72% of these records are older, 25% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2010 · median 2004 among the 125 with a school on file
- Record last updated2021 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Colorado
There are 182 infectious disease physician records in Colorado.
All 182 in Colorado → Every provider in Denver → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Robert Belknap, MDDenver, CO 802041578573051
- William Burman, MDDenver, CO 802041962422246
- David Cohn, MDDenver, CO 802041487677217
- Edward Gardner, MDDenver, CO 802041710991914
- Michelle Haas, MDDenver, CO 802041043402944
- Timothy Jenkins, M.D.Denver, CO 802041114959467
- Margaret McLees, MDDenver, CO 802041811087497
- Karen Peterson, MDDenver, CO 802041376659839
Common questions
What is Grace Ellen Marx, M.D.'s NPI number?
Grace Ellen Marx, M.D.'s National Provider Identifier (NPI) is 1144545799, issued on Apr 6, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Grace Ellen Marx, M.D. located?
The NPPES record lists a practice address at 605 Bannock St, Denver, CO, 80204. Phone: (303) 602-8736. Providers update this record themselves, so call before visiting.
How can I verify Grace Ellen Marx, M.D.'s license?
NPPES lists Colorado license number 52448, 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 Grace Ellen Marx, M.D. prescribe under Medicare Part D?
In 2024, Grace Ellen Marx, M.D. had 232 Medicare Part D claims; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
What is Grace Ellen Marx, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.