NPPES file of Aug 9, 2026

William Marshall Chisholm, M.D.

Geriatric Medicine (Family Medicine) Physician · Aurora, CO

William Marshall Chisholm, M.D. is a geriatric medicine (family medicine) physician with a practice address in Aurora, Colorado, and NPI 1932425923, issued on Apr 15, 2010. Check the license (Colorado 53208, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1932425923
Name
William Marshall Chisholm
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Family Medicine) Physician 207QG0300X
License number
53208 CO
Self-reported in NPPES; status is on the state search
Practice location
1400 S Potomac St, Aurora, CO 80012
Phone
(303) 306-4321
Enumerated
Apr 15, 2010
Record last updated
May 19, 2015 (not updated in 11 years: call before relying on the address or phone)
Fax
(720) 524-1551
Medicaid ID
59172282 CO
Medicare enrollment
Enrolled (PECOS I20131207000180); accepts Medicare assignment
Medical or professional school
University Of Colorado School Of Medicine, Denver, 2013
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (family medicine) physician records → All 28 in Colorado → Look up another NPI →

Also registered at 1400 S Potomac St

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

  1. Stephen Alix, M.D.Internal Medicine Physician1063473361
  2. Karen Bassford, RN CNMAdvanced Practice Midwife1700874609
  3. Howard Corren, MDFamily Medicine Physician1114994696
  4. Noelle Graff Logan, CNMMidwife1841219516
  5. Sz-Min Harley, MDObstetrics & Gynecology Physician1023336815
  6. Michelle Hartman, CNMAdvanced Practice Midwife1336137405

Verify William Marshall Chisholm in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersColorado Medical Board
    Search for license 53208    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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38% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024

3,220 Medicare Part D claims for 318 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 61 claims were for opioids.

  1. William Chisholm3,220
  2. Specialty average5,222

Most prescribed

  1. Levothyroxine Sodium270 claims
  2. Atorvastatin Calcium156 claims
  3. Furosemide115 claims
  4. Sertraline Hcl109 claims
  5. Eliquis99 claims
  6. Quetiapine Fumarate99 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.

Bills Medicare through one group practice

  1. Physician Housecalls LLCLakewood, CO

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

William Marshall Chisholm among 28 geriatric medicine (family medicine) physician records in Colorado

William Marshall Chisholm, M.D. is one of 28 geriatric medicine (family medicine) 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. Its NPI, issued in 2010, is newer than 79% of them.

  • NPI issued2010 · 79% of these records are older, 11% newer
  • In a Medicare fileYes · 75% of these records are
  • In the CMS Doctors and Clinicians fileYes · 50% of these records are
  • Graduated2013 · median 2007 among the 14 with a school on file
  • Record last updated2015 · 71% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Family Medicine) Physician providers in Colorado

There are 28 geriatric medicine (family medicine) physician records in Colorado.

All 28 in Colorado → Every provider in Aurora → Geriatric Medicine (Family Medicine) Physician nationwide →

The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes

  1. Jeannae Dergance, MDAurora, CO 800141841237070
  2. Shirley Frantz, M.D.Aurora, CO 800141942209937
  3. Rachel Rackler, M.D.Aurora, CO 800141184959157
  4. Patrick Roney, MDAurora, CO 800141578669172
  5. Mary James, MDWestminster, CO 800231750600664
  6. John Shepherd, MDLafayette, CO 800261811985070
  7. Juliana Wilking-Johnson, M.D.Westminster, CO 800311285089052
  8. Jane Kim, M.D.Lakewood, CO 802281912970682

Common questions

What is William Marshall Chisholm, M.D.'s NPI number?

William Marshall Chisholm, M.D.'s National Provider Identifier (NPI) is 1932425923, issued on Apr 15, 2010. An NPI identifies a provider in billing; it is not a license.

Where is William Marshall Chisholm, M.D. located?

The NPPES record lists a practice address at 1400 S Potomac St, Aurora, CO, 80012. Phone: (303) 306-4321. Providers update this record themselves, so call before visiting.

How can I verify William Marshall Chisholm, M.D.'s license?

NPPES lists Colorado license number 53208, 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 William Marshall Chisholm, M.D. prescribe under Medicare Part D?

In 2024, William Marshall Chisholm, M.D. had 3,220 Medicare Part D claims for 318 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.

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.