Michael Brian Maris, MD
Hematology & Oncology Physician · Denver, CO
Michael Brian Maris, MD is a hematology & oncology physician with a practice address in Denver, Colorado, and NPI 1053395624, issued on Dec 6, 2005. Check the license (Colorado 43475, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Michael Brian Maris
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 43475 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1800 Williams St, Denver, CO 80218
- Phone
- (720) 754-4800
- Enumerated
- Dec 6, 2005
- Record last updated
- Oct 1, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (720) 754-4801
- Medicaid IDs
- 200443060B KS
33784007 NM
10025893500 NE
123706300 WY - Medicare enrollment
- Enrolled (PECOS I20050507000059); accepts Medicare assignment
- Medical or professional school
- Perelman School Of Med At The University Of Pennsylvania, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 212 in Colorado → Look up another NPI →
Also registered at 1800 Williams St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lindsay Bramwell, RN, MSN, CNSClinical Nurse Specialist1700043577
- Allen Cohn, MDHematology & Oncology Physician1316921976
- Julie Elliott, PAPhysician Assistant1689686131
- Gerald Falchook, MDMedical Oncology Physician1366541294
- Kathryn Howell, MDRadiation Oncology Physician1811971542
- Kelly MackNurse Practitioner1982742888
Verify Michael Brian Maris in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 43475Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,164 Medicare Part D claims for 75 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Acyclovir91 claims
- Jakafi78 claims
- Sulfamethoxazole-Trimethoprim70 claims
- Valacyclovir63 claims
- Pantoprazole Sodium38 claims
- Ursodiol35 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 MIPS final score for 2023 (Medicare payment program): 62.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $196.98
9 payments; by number, the most common kind was food and beverage; the largest payer was Celgene Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 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
- Healthone Clinic Services - Oncology Hematology LLCDenver, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Brian Maris among 212 hematology & oncology physician records in Colorado
Michael Brian Maris, MD is one of 212 hematology & oncology physician records with a practice address in Colorado. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 70% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1995 · median 2004 among the 150 with a school on file
- Record last updated2013 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Colorado
There are 212 hematology & oncology physician records in Colorado.
All 212 in Colorado → Every provider in Denver → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Michele Basche, MDDenver, CO 802181306820022
- Scott Bearman, MDDenver, CO 802181528042249
- Mark Brunvand, MDDenver, CO 802181891779534
- Allen Cohn, MDDenver, CO 802181316921976
- Deborah Cook, M.D.Denver, CO 802181598706186
- Kerry Fisher, MDDenver, CO 802181730195033
- Richard Hesky, M.D.Denver, CO 802181225061914
- Ioana Hinshaw, MDDenver, CO 802181033193180
Common questions
What is Michael Brian Maris, MD's NPI number?
Michael Brian Maris, MD's National Provider Identifier (NPI) is 1053395624, issued on Dec 6, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Michael Brian Maris, MD located?
The NPPES record lists a practice address at 1800 Williams St, Denver, CO, 80218. Phone: (720) 754-4800. Providers update this record themselves, so call before visiting.
How can I verify Michael Brian Maris, MD's license?
NPPES lists Colorado license number 43475, 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 Michael Brian Maris, MD prescribe under Medicare Part D?
In 2024, Michael Brian Maris, MD had 1,164 Medicare Part D claims for 75 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Michael Brian Maris, MD's MIPS final score?
The 2023 MIPS final score is 62.7 of 100. 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.