Mary Theresa Bessesen, M.D.
Infectious Disease Physician · Denver, CO
Mary Theresa Bessesen, M.D. is an infectious disease physician with a practice address in Denver, Colorado, and NPI 1235160672, issued on Jul 5, 2006. Check the license (Colorado 25940, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mary Theresa Bessesen
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 25940 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1055 Clermont St, Denver, CO 80220
- Phone
- (303) 393-2837
- Enumerated
- Jul 5, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 182 in Colorado → Look up another NPI →
Also registered at 1055 Clermont St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Heather Able, RNRegistered Nurse1124264726
- Sergio Aguilar, MSWClinical Social Worker1497099352
- Stephen Albert, D.P.M.Primary Podiatric Medicine Podiatrist1497798144
- Mary Albyn, R.PH.Pharmacist1477689073
- Edward Alvarez, RNRegistered Nurse1407919459
- Colleen Ambrozy, BS PHARMPharmacist1174570980
Verify Mary Theresa Bessesen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 25940Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average infectious disease physician in 2024
29 Medicare Part D claims, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D.
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.
Mary Theresa Bessesen among 182 infectious disease physician records in Colorado
Mary Theresa Bessesen, 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 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2007 · 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
- Westyn Branch-Elliman, MDDenver, CO 802201437318425
- Kenneth Greenberg, D.O.Denver, CO 802201972587228
- Dana Lerman, MDDenver, CO 802201861653107
- Ellen Mangione, MD, MPHDenver, CO 802201881853513
- John Redington, MDDenver, CO 802201124043443
- Larry Fisher, MDDenver, CO 802191255333076
- Raymond Blum, M.D.Denver, CO 802181588841688
- John Douglas, M.D.Denver, CO 802181124135793
Common questions
What is Mary Theresa Bessesen, M.D.'s NPI number?
Mary Theresa Bessesen, M.D.'s National Provider Identifier (NPI) is 1235160672, issued on Jul 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Theresa Bessesen, M.D. located?
The NPPES record lists a practice address at 1055 Clermont St, Denver, CO, 80220. Phone: (303) 393-2837. Providers update this record themselves, so call before visiting.
How can I verify Mary Theresa Bessesen, M.D.'s license?
NPPES lists Colorado license number 25940, 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 Mary Theresa Bessesen, M.D. prescribe under Medicare Part D?
In 2024, Mary Theresa Bessesen, M.D. had 29 Medicare Part D claims; the average among infectious disease physician prescribers was 689. 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.