John M. Barnett, MD
Hematology & Oncology Physician · Longmont, CO
John M. Barnett, MD is a hematology & oncology physician with a practice address in Longmont, Colorado, and NPI 1952341273, issued on Jun 7, 2006. Check the license (Colorado 44274, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- John M. Barnett
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 44274 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1760 E Ken Pratt Blvd Ste 302, Longmont, CO 80504
- Phone
- (303) 684-1900
- Enumerated
- Jun 7, 2006
- Record last updated
- Jul 6, 2023
- Fax
- (303) 684-1925
- Medicaid ID
- 65187741 CO
- Medicare enrollment
- Enrolled (PECOS I20060804000354); accepts Medicare assignment
- Medical or professional school
- Southern Illinois University School Of Medicine, 2000
- 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 1760 E Ken Pratt Blvd Ste 302
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shelley Albright, RNOncology Registered Nurse1629938378
- Kyle BoxRegistered Nurse1780516476
- Kelly Casteel, MDHematology & Oncology Physician1740536291
- Emily Cause, RNOncology Registered Nurse1851265177
- Teresa D'Angelo, MSN, RNRegistered Nurse1023958030
- Lerin Dhein, RNOncology Registered Nurse1508745399
Verify John M. Barnett in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 44274Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average hematology & oncology physician in 2024
1,803 Medicare Part D claims for 269 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 34 claims were for opioids.
Most prescribed
- Prednisone145 claims
- Abiraterone Acetate131 claims
- Gabapentin101 claims
- Eliquis91 claims
- Dexamethasone88 claims
- Acyclovir70 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): 84.8 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).
Bills Medicare through 2 group practices
- Rocky Mountain Cancer Centers LLPLongmont, CO
- Select Physical Therapy Holdings IncLoveland, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John M. Barnett among 212 hematology & oncology physician records in Colorado
John M. Barnett, 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 2006, is newer than 30% of them.
- NPI issued2006 · 30% of these records are older, 51% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2000 · median 2004 among the 150 with a school on file
- Record last updated2023 · 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 Longmont → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Kelly Casteel, MDLongmont, CO 805041740536291
- Hossein Maymani, MDLongmont, CO 805041023303096
- Sara Robinson, M.D.Longmont, CO 805041124293535
- Robert Fisher, MDLongmont, CO 805011992789598
- Michael Johnson, MDLongmont, CO 805011841274495
- Farrah Datko, MDFort Collins, CO 805281760697171
- Lakshmi Kolandra, D.O.Fort Collins, CO 805281396271052
- Robert Marschke, M.D.Fort Collins, CO 805281669455754
Common questions
What is John M. Barnett, MD's NPI number?
John M. Barnett, MD's National Provider Identifier (NPI) is 1952341273, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John M. Barnett, MD located?
The NPPES record lists a practice address at 1760 E Ken Pratt Blvd Ste 302, Longmont, CO, 80504. Phone: (303) 684-1900. Providers update this record themselves, so call before visiting.
How can I verify John M. Barnett, MD's license?
NPPES lists Colorado license number 44274, 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 John M. Barnett, MD prescribe under Medicare Part D?
In 2024, John M. Barnett, MD had 1,803 Medicare Part D claims for 269 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is John M. Barnett, MD's MIPS final score?
The 2023 MIPS final score is 84.8 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.