NPPES file of Aug 9, 2026

John G. Grantham, M.D.

Diagnostic Radiology Physician · Boulder, CO

John G. Grantham, M.D. is a diagnostic radiology physician with a practice address in Boulder, Colorado, and NPI 1992789614, issued on Dec 6, 2005. Check the license (Colorado 26497, as entered in NPPES) on the Colorado Medical Board; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1992789614
Name
John G. Grantham
Credential
M.D.
Primary taxonomy
Diagnostic Radiology Physician 2085R0202X
License number
26497 CO
Self-reported in NPPES; status is on the state search
Practice location
2750 Broadway St, Boulder, CO 80304
Phone
(303) 440-3000
Enumerated
Dec 6, 2005
Record last updated
Oct 31, 2012 (not updated in 14 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest diagnostic radiology physician records → All 796 in Colorado → Look up another NPI →

Also registered at 2750 Broadway St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Melinda AndersonAudiologist1942458948
  2. Karen Andrews, MDAllergy Physician1750365565
  3. Sarah Baade, AUDAudiologist1700028958
  4. Karen Bant-Kreutzer, ANP-CAdult Health Nurse Practitioner1093146110
  5. Erin Beaudin, FNPFamily Nurse Practitioner1558194290
  6. Pamela Christine BelinAudiologist1750598991

Verify John G. Grantham in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersColorado Medical Board
    Search for license 26497    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Colorado license search

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John G. Grantham among 796 diagnostic radiology physician records in Colorado

John G. Grantham, M.D. is one of 796 diagnostic radiology physician records with a practice address in Colorado. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 86% newer
  • In a Medicare fileNo · 75% of these records are
  • In the CMS Doctors and Clinicians fileNo · 71% of these records are
  • Record last updated2012 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Diagnostic Radiology Physician providers in Colorado

There are 796 diagnostic radiology physician records in Colorado. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 796 in Colorado → Every provider in Boulder → Diagnostic Radiology Physician nationwide →

The 8 diagnostic radiology physician records with the nearest ZIP codes

  1. Charles Bowles, M.D.Boulder, CO 803041417922105
  2. Richard Finer, M.D.Boulder, CO 803041669465001
  3. Natalia Gaulke, D.O.Boulder, CO 803041295054047
  4. Robert Helgans, M.D.Boulder, CO 803041295728780
  5. Dai Hoang, M.D.Boulder, CO 803041225137102
  6. Jie Mao, M.D.Boulder, CO 803041942293485
  7. Stephen Miller, M.D.Boulder, CO 803041821063371
  8. Christopher Nusser, M.D.Boulder, CO 803041538152038

Common questions

What is John G. Grantham, M.D.'s NPI number?

John G. Grantham, M.D.'s National Provider Identifier (NPI) is 1992789614, issued on Dec 6, 2005. An NPI identifies a provider in billing; it is not a license.

Where is John G. Grantham, M.D. located?

The NPPES record lists a practice address at 2750 Broadway St, Boulder, CO, 80304. Phone: (303) 440-3000. Providers update this record themselves, so call before visiting.

How can I verify John G. Grantham, M.D.'s license?

NPPES lists Colorado license number 26497, 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.