Stefanie L. Krenz, MD
Internal Medicine Physician · Boulder, CO
Stefanie L. Krenz, MD is an internal medicine physician with a practice address in Boulder, Colorado, and NPI 1982676250, issued on Feb 2, 2006. Check the license (Colorado DR.0039594, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Stefanie L. Krenz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- DR.0039594 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4747 Arapahoe Ave, Boulder, CO 80303
- Phone
- (303) 415-7610
- Enumerated
- Feb 2, 2006
- Record last updated
- Oct 8, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (303) 415-7618
- Medicaid ID
- 46139869 CO
- Medicare enrollment
- Enrolled (PECOS I20101104000323); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 1998
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 4747 Arapahoe Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Stefanie L. Krenz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0039594Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
152 Medicare Part D claims for 90 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of 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.
One hospital affiliation
- Boulder Community HealthBoulder, CO · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Stefanie L. Krenz among 2,046 internal medicine physician records in Colorado
Stefanie L. Krenz, MD is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1998 · median 2006 among the 1,090 with a school on file
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
74 internal medicine physician records list a practice address in Boulder
They are 74 of the 5,635 NPPES records with a practice address in Boulder, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Boulder → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Mark Haimes, MDBoulder, CO 803031114908613
- Stephen Hoerler, M.D.Boulder, CO 803031962404400
- Benjamin Keidan, MDBoulder, CO 803031316032584
- Valerie Lipetz, MDBoulder, CO 803031356323745
- Diana Mancini, MDBoulder, CO 803031619990090
- Martha Montour, RNBoulder, CO 803031013051895
Common questions
What is Stefanie L. Krenz, MD's NPI number?
Stefanie L. Krenz, MD's National Provider Identifier (NPI) is 1982676250, issued on Feb 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stefanie L. Krenz, MD located?
The NPPES record lists a practice address at 4747 Arapahoe Ave, Boulder, CO, 80303. Phone: (303) 415-7610. Providers update this record themselves, so call before visiting.
How can I verify Stefanie L. Krenz, MD's license?
NPPES lists Colorado license number DR.0039594, 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 Stefanie L. Krenz, MD prescribe under Medicare Part D?
In 2024, Stefanie L. Krenz, MD had 152 Medicare Part D claims for 90 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.