NPPES file of Aug 9, 2026

Hillary Day Lum, M.D., PH.D.

Geriatric Medicine (Internal Medicine) Physician · Aurora, CO

Hillary Day Lum, M.D., PH.D. is a geriatric medicine (internal medicine) physician with a practice address in Aurora, Colorado, and NPI 1336301191, issued on Jul 1, 2008. Check the license (Colorado 49904, 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
1336301191
Name
Hillary Day Lum
Credential
M.D., PH.D.
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License number
49904 CO
Self-reported in NPPES; status is on the state search
Practice location
12605 E 16TH Ave, Aurora, CO 80045
Phone
(720) 848-0000
Enumerated
Jul 1, 2008
Record last updated
Aug 6, 2014 (not updated in 12 years: call before relying on the address or phone)
Medicaid ID
50936824 CO
Medicare enrollment
Enrolled (PECOS I20130916000109); accepts Medicare assignment
Medical or professional school
University Of Wisconsin School Of Medicine, 2008
Telehealth
Offers telehealth (CMS)
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 (internal medicine) physician records → All 103 in Colorado → Look up another NPI →

Also registered at 12605 E 16TH Ave

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

  1. Benjamin Aakre, MDAnesthesiology Physician1407140395
  2. Alec Aaronson, DOPsychiatry Physician1972065233
  3. Mona Abaza, MDOtolaryngology Physician1043313844
  4. Meagan AbbagnaroAnesthesiologist Assistant1851254262
  5. Jean Abbott, MDEmergency Medicine Physician1578672820
  6. Adam Abraham, MDInternal Medicine Physician1720178304

Verify Hillary Day Lum in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersColorado Medical Board
    Search for license 49904    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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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73% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

1,163 Medicare Part D claims for 117 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. 20 claims were for opioids.

  1. Hillary Lum1,163
  2. Specialty average4,246

Most prescribed

  1. Atorvastatin Calcium70 claims
  2. Amlodipine Besylate45 claims
  3. Eliquis44 claims
  4. Memantine Hcl44 claims
  5. Duloxetine Hcl42 claims
  6. Lisinopril41 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. University Physicians IncorporatedAurora, CO

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

Hillary Day Lum among 103 geriatric medicine (internal medicine) physician records in Colorado

Hillary Day Lum, M.D., PH.D. is one of 103 geriatric medicine (internal 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 2008, is newer than 70% of them.

  • NPI issued2008 · 70% of these records are older, 26% newer
  • In a Medicare fileYes · 75% of these records are
  • In the CMS Doctors and Clinicians fileYes · 50% of these records are
  • Graduated2008 · median 1998 among the 51 with a school on file
  • Record last updated2014 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X 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 (Internal Medicine) Physician providers in Colorado

There are 103 geriatric medicine (internal medicine) physician records in Colorado.

All 103 in Colorado → Every provider in Aurora → Geriatric Medicine (Internal Medicine) Physician nationwide →

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

  1. Eric Coleman, MDAurora, CO 800451780774463
  2. Janna Hardland, MDAurora, CO 800451871939058
  3. Kerry Hildreth, MDAurora, CO 800451982825543
  4. Carolyn HorneyAurora, CO 800451346567195
  5. Evelyn Hutt, MDAurora, CO 800451619933454
  6. Cari Levy, MDAurora, CO 800451831289412
  7. Daniel Matlock, MDAurora, CO 800451417003021
  8. Bennett Parnes, MDAurora, CO 800451124133103

Common questions

What is Hillary Day Lum, M.D., PH.D.'s NPI number?

Hillary Day Lum, M.D., PH.D.'s National Provider Identifier (NPI) is 1336301191, issued on Jul 1, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Hillary Day Lum, M.D., PH.D. located?

The NPPES record lists a practice address at 12605 E 16TH Ave, Aurora, CO, 80045. Phone: (720) 848-0000. Providers update this record themselves, so call before visiting.

How can I verify Hillary Day Lum, M.D., PH.D.'s license?

NPPES lists Colorado license number 49904, 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 Hillary Day Lum, M.D., PH.D. prescribe under Medicare Part D?

In 2024, Hillary Day Lum, M.D., PH.D. had 1,163 Medicare Part D claims for 117 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.