John Peter Mars, MD
Preventive Medicine/Occupational Environmental Medicine Physician · Longmont, CO
John Peter Mars, MD is a preventive medicine/occupational environmental medicine physician with a practice address in Longmont, Colorado, and NPI 1316077506, issued on Mar 6, 2007. Check the license (Colorado 36685, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Peter Mars
- Credential
- MD
- Primary taxonomy
- Preventive Medicine/Occupational Environmental Medicine Physician 2083P0500X
- License number
- 36685 CO
Self-reported in NPPES; status is on the state search - Practice location
- 205 S Main St, Longmont, CO 80501
- Phone
- (303) 702-1612
- Enumerated
- Mar 6, 2007
- Record last updated
- Sep 28, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (303) 774-7899
- Entity
- Type 1 · individual
8 nearest preventive medicine/occupational environmental medicine physician records → All 42 in Colorado → Look up another NPI →
Also registered at 205 S Main St
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Verify John Peter Mars in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 36685Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $28,133.44
18 payments; by number, the most common kind was consulting fee; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 71 providers of this specialty with any payment received $2,513.26 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.
John Peter Mars among 42 preventive medicine/occupational environmental medicine physician records in Colorado
John Peter Mars, MD is one of 42 preventive medicine/occupational environmental medicine physician records with a practice address in Colorado. 14% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 24% of them.
- NPI issued2007 · 24% of these records are older, 26% newer
- In a Medicare fileYes · 14% of these records are
- In the CMS Doctors and Clinicians fileNo · 5% of these records are
- Record last updated2018 · 76% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2083P0500X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Preventive Medicine/Occupational Environmental Medicine Physician providers in Colorado
There are 42 preventive medicine/occupational environmental medicine physician records in Colorado.
All 42 in Colorado → Every provider in Longmont → Preventive Medicine/Occupational Environmental Medicine Physician nationwide →
The 8 preventive medicine/occupational environmental medicine physician records with the nearest ZIP codes
- Brian Thompson, M.D.Fort Collins, CO 805241205980463
- Bruce Belleville, M.D.Fort Collins, CO 805261073670873
- William Milliken, MDWindsor, CO 805281578552360
- Marc-Andre Chimonas, M.D.Loveland, CO 805381538238704
- Rachel Fischer, MDLoveland, CO 805381811127780
- Patrick Quigley, M.D., M.S.Loveland, CO 805381780724625
- James Rafferty, DOGreeley, CO 806311821160466
- Mark Frank, M.D.Boulder, CO 803051952422446
Common questions
What is John Peter Mars, MD's NPI number?
John Peter Mars, MD's National Provider Identifier (NPI) is 1316077506, issued on Mar 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Peter Mars, MD located?
The NPPES record lists a practice address at 205 S Main St, Longmont, CO, 80501. Phone: (303) 702-1612. Providers update this record themselves, so call before visiting.
How can I verify John Peter Mars, MD's license?
NPPES lists Colorado license number 36685, 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.
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.