Eric J. Harker, MD
Internal Medicine Physician · Lyons, CO
Eric J. Harker, MD is an internal medicine physician with a practice address in Lyons, Colorado, and NPI 1366572109, issued on Mar 7, 2007. Check the license (Colorado 41328, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Eric J. Harker
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 41328 CO
Self-reported in NPPES; status is on the state search - Practice location
- 754 Apple Valley RD, Lyons, CO 80540
- Phone
- (303) 748-5781
- Enumerated
- Mar 7, 2007
- Record last updated
- Jun 14, 2022
- Medicaid ID
- 09054201 CO
- Medicare enrollment
- Enrolled (PECOS I20230828003014); accepts Medicare assignment
- Medical or professional school
- Duke University School Of Medicine, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Verify Eric J. Harker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 41328Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
32 Medicare Part D claims for 16 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 50% 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.
Bills Medicare through one group practice
- Nuvoair Medical PCHoover, AL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eric J. Harker among 2,046 internal medicine physician records in Colorado
Eric J. Harker, 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 39% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2001 · median 2006 among the 1,090 with a school on file
- Record last updated2022 · 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).
1 internal medicine physician record lists a practice address in Lyons
They are 1 of the 56 NPPES records with a practice address in Lyons, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Lyons → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nathan Ayer, M.D., M.P.H.Loveland, CO 805381457361172
- Venugopal Damerla, M.D.Loveland, CO 805381609046655
- Shauna Grady, D.O.Loveland, CO 805381164867735
- Edward Grosboll, M.D.Loveland, CO 805381073780169
- Bertrand Honea, M.D.Loveland, CO 805381194742981
- Christopher Jones, MD, PHDLoveland, CO 805381003074501
- James McReynolds, MDLoveland, CO 805381184844169
- Nicholaus Mize, D.OLoveland, CO 805381629459482
Common questions
What is Eric J. Harker, MD's NPI number?
Eric J. Harker, MD's National Provider Identifier (NPI) is 1366572109, issued on Mar 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Eric J. Harker, MD located?
The NPPES record lists a practice address at 754 Apple Valley RD, Lyons, CO, 80540. Phone: (303) 748-5781. Providers update this record themselves, so call before visiting.
How can I verify Eric J. Harker, MD's license?
NPPES lists Colorado license number 41328, 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 Eric J. Harker, MD prescribe under Medicare Part D?
In 2024, Eric J. Harker, MD had 32 Medicare Part D claims for 16 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.