James Douglas Warren, M.D.
Otolaryngology Physician · Boulder, CO
James Douglas Warren, M.D. is an otolaryngology physician with a practice address in Boulder, Colorado, and NPI 1194743450, issued on Jul 17, 2006. Check the license (Colorado 29977, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- James Douglas Warren
- Credential
- M.D.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- 29977 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4745 Arapahoe Ave, Boulder, CO 80303
- Phone
- (303) 443-2771
- Enumerated
- Jul 17, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (303) 443-2784
- Medicaid ID
- 01299775 CO
- Medicare enrollment
- Enrolled (PECOS I20080717000823); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 188 in Colorado → Look up another NPI →
Also registered at 4745 Arapahoe Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Douglas Warren in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 29977Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average otolaryngology physician in 2024
333 Medicare Part D claims for 124 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Fluticasone Propionate115 claims
- Ipratropium Bromide53 claims
- Montelukast Sodium39 claims
- Amoxicillin-Clavulanate Potass31 claims
- Cephalexin13 claims
- Prednisone11 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.
Industry payments in 2024: $104.72
4 payments; by number, the most common kind was food and beverage; the largest payer was Aerin Medical Inc. The 6,429 providers of this specialty with any payment received $1,922.50 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
- Boulder Valley Ear Nose And Throat Associates PCBoulder, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Douglas Warren among 188 otolaryngology physician records in Colorado
James Douglas Warren, M.D. is one of 188 otolaryngology physician records with a practice address in Colorado. 81% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 57% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1984 · median 2007 among the 136 with a school on file
- Record last updated2023 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in Colorado
There are 188 otolaryngology physician records in Colorado.
All 188 in Colorado → Every provider in Boulder → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Andrew Goldman, M.D.Boulder, CO 803031891713152
- Andrew Johnson, MDBoulder, CO 803031811330905
- Donald Maschka, M.D.Boulder, CO 803031316933484
- David Morrissey, M.D.Boulder, CO 803031104844463
- Angela Paddack, M.D.Boulder, CO 803031871767954
- Don Schilling, M.D.Boulder, CO 803031881612141
- Mark Hunter, M.D.Boulder, CO 803041245464692
- William Lillydahl, M.D.Boulder, CO 803041770568982
Common questions
What is James Douglas Warren, M.D.'s NPI number?
James Douglas Warren, M.D.'s National Provider Identifier (NPI) is 1194743450, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Douglas Warren, M.D. located?
The NPPES record lists a practice address at 4745 Arapahoe Ave, Boulder, CO, 80303. Phone: (303) 443-2771. Providers update this record themselves, so call before visiting.
How can I verify James Douglas Warren, M.D.'s license?
NPPES lists Colorado license number 29977, 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 James Douglas Warren, M.D. prescribe under Medicare Part D?
In 2024, James Douglas Warren, M.D. had 333 Medicare Part D claims for 124 beneficiaries; the average among otolaryngology physician prescribers was 541. 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.