John J. Napierkowski, M.D.
Gastroenterology Physician · Lafayette, CO
John J. Napierkowski, M.D. is a gastroenterology physician with a practice address in Lafayette, Colorado, and NPI 1801877683, issued on Nov 9, 2005. Check the license (Colorado 46539, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- John J. Napierkowski
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 46539 CO
99-94 NM
Self-reported in NPPES; status is on the state search - Practice location
- 280 Exempla Cir, Lafayette, CO 80026
- Phone
- (303) 338-4545
- Enumerated
- Nov 9, 2005
- Record last updated
- Jun 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 43389261 CO
- Medicare enrollment
- Enrolled (PECOS I20081007000553); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1996
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 334 in Colorado → Look up another NPI →
Also registered at 280 Exempla Cir
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Phyllis Acker, RNRheumatology Physician1821125709
- Brian AcresAmbulatory Care Registered Nurse1174865752
- Jennifer AirhartNurse's Aide1336276310
- Alice Albert, ODOptometrist1639206683
- Jill Allen, R.N.Registered Nurse1114043726
- Sandra AllenNurse's Aide1760519789
Verify John J. Napierkowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 46539Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% more Medicare Part D claims than the average gastroenterology physician in 2024
980 Medicare Part D claims for 536 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Gavilyte-C403 claims
- Pantoprazole Sodium126 claims
- Omeprazole115 claims
- Budesonide Dr93 claims
- Mesalamine21 claims
- Azathioprine18 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
- Colorado Permanente Medical Group PCLafayette, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John J. Napierkowski among 334 gastroenterology physician records in Colorado
John J. Napierkowski, M.D. is one of 334 gastroenterology physician records with a practice address in Colorado. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1996 · median 2003 among the 258 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Colorado
There are 334 gastroenterology physician records in Colorado.
All 334 in Colorado → Every provider in Lafayette → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- William Berry, MDLafayette, CO 800261356471296
- Erica Boettcher, MDLafayette, CO 800261609038454
- Joseph Cassara, M.D.Lafayette, CO 800261275755290
- Britt Drake, M.D.Lafayette, CO 800261306976170
- Kerri Glassner, D.O.Lafayette, CO 800261568872778
- Wesley Kasen, MDLafayette, CO 800261366503823
- Daus Mahnke, M.D.Lafayette, CO 800261306878566
- David Nolan, MDLafayette, CO 800261437338803
Common questions
What is John J. Napierkowski, M.D.'s NPI number?
John J. Napierkowski, M.D.'s National Provider Identifier (NPI) is 1801877683, issued on Nov 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John J. Napierkowski, M.D. located?
The NPPES record lists a practice address at 280 Exempla Cir, Lafayette, CO, 80026. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify John J. Napierkowski, M.D.'s license?
NPPES lists Colorado license number 46539, 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 John J. Napierkowski, M.D. prescribe under Medicare Part D?
In 2024, John J. Napierkowski, M.D. had 980 Medicare Part D claims for 536 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.