John A. Grossman, M.D.
Specialist · Denver, CO
John A. Grossman, M.D. is a specialist with a practice address in Denver, Colorado, and NPI 1609830090, issued on Apr 13, 2006. Check the license (Colorado 18139, as entered in NPPES) with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John A. Grossman
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 18139 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4600 Hale Pkwy, Denver, CO 80220
- Phone
- (303) 320-5566
- Enumerated
- Apr 13, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (303) 320-1453
- Entity
- Type 1 · individual
8 nearest specialist records → All 1,105 in Colorado → Look up another NPI →
Also registered at 4600 Hale Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John A. Grossman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license 18139Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average specialist in 2024
16 Medicare Part D claims for 12 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Valacyclovir16 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: $6,170.63
11 payments; by number, the most common kind was compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program; the largest payer was Abbvie Inc. The 5,844 providers of this specialty with any payment received $4,760.79 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 A. Grossman among 1,105 specialist records in Colorado
John A. Grossman, M.D. is one of 1,105 specialist records with a practice address in Colorado. 12% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 76% newer
- In a Medicare fileYes · 12% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2026 · 89% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in Colorado
There are 1,105 specialist records in Colorado.
All 1,105 in Colorado → Every provider in Denver → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- John Bershof, M.D.Denver, CO 802201316029937
- Tony Bianchi, M.D.Denver, CO 802201093840837
- Patrick Haley, M.D.Denver, CO 802201619916210
- Betsy Huseby, RPTDenver, CO 802201225054497
- Jordan Klein, M.D.Denver, CO 802201689788960
- Anthony Laporta, M.D.Denver, CO 802201346204682
- Donna Lonergan, CTRSDenver, CO 802201346295243
- Steven Oboler, M.D.Denver, CO 802201013164904
Common questions
What is John A. Grossman, M.D.'s NPI number?
John A. Grossman, M.D.'s National Provider Identifier (NPI) is 1609830090, issued on Apr 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John A. Grossman, M.D. located?
The NPPES record lists a practice address at 4600 Hale Pkwy, Denver, CO, 80220. Phone: (303) 320-5566. Providers update this record themselves, so call before visiting.
How can I verify John A. Grossman, M.D.'s license?
NPPES lists Colorado license number 18139, as entered by the provider. Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
How much does John A. Grossman, M.D. prescribe under Medicare Part D?
In 2024, John A. Grossman, M.D. had 16 Medicare Part D claims for 12 beneficiaries; the average among specialist prescribers was 1,380. 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.