Mark W. Walker, FNP-C
Family Nurse Practitioner · Naturita, CO
Mark W. Walker, FNP-C is a family nurse practitioner with a practice address in Naturita, Colorado, and NPI 1376807040, issued on Jun 27, 2012. Check the license (Colorado C-APN.0992626-C-NP, as entered in NPPES) with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark W. Walker
- Credential
- FNP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- C-APN.0992626-C-NP CO
564634 TX
Self-reported in NPPES; status is on the state search - Practice location
- 421 Adams St, Naturita, CO 81422
- Phone
- (970) 865-2665
- Enumerated
- Jun 27, 2012
- Record last updated
- Sep 30, 2024
- Fax
- (970) 865-2674
- Medicare enrollment
- Enrolled (PECOS I20120831000066); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 3,492 in Colorado → Look up another NPI →
Also registered at 421 Adams St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Elizabeth Brown, FNPNurse Practitioner1144614470
- Mary Kus, APRN, FNP-CFamily Nurse Practitioner1720765589
- Lyudmyla Polishchuk, FNPFamily Medicine Physician1922849017
- April Randle, M.D.Internal Medicine Physician1679780613
- Carolyn Scott, PA-CPhysician Assistant1467692962
Verify Mark W. Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license C-APN.0992626-C-NPCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average family nurse practitioner in 2024
209 Medicare Part D claims for 87 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Omeprazole12 claims
- Amlodipine Besylate11 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.
Industry payments in 2024: $16.92
1 payment: food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Tmc Provider Group PLLCSan Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark W. Walker among 3,492 family nurse practitioner records in Colorado
Mark W. Walker, FNP-C is one of 3,492 family nurse practitioner records with a practice address in Colorado. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 23% of them.
- NPI issued2012 · 23% of these records are older, 74% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2012 · median 2019 among the 1,950 with a school on file
- Record last updated2024 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 family nurse practitioner records list a practice address in Naturita
They are 3 of the 10 NPPES records with a practice address in Naturita, and 3,492 family nurse practitioner records in Colorado.
All 3,492 in Colorado → Every provider in Naturita → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Mary Kus, APRN, FNP-CNaturita, CO 814221720765589
- Robert Tapley, APRN-BC FNPNaturita, CO 814221306091061
- Scott Hunter, FNPNorwood, CO 814231316318447
- Christi Anderson, RN, MSN, WHNP-BC, NPHotchkiss, CO 814191346697364
- Doran Tregarthen, FNPHotchkiss, CO 814191053124818
- Debra Hillyer, FNP-C/PA-CEckert, CO 814181194925586
- Julie Fournier, NP-CDelta, CO 814161053625798
- Jessica Gibson, FNP-BCDelta, CO 814161972270288
Common questions
What is Mark W. Walker, FNP-C's NPI number?
Mark W. Walker, FNP-C's National Provider Identifier (NPI) is 1376807040, issued on Jun 27, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Mark W. Walker, FNP-C located?
The NPPES record lists a practice address at 421 Adams St, Naturita, CO, 81422. Phone: (970) 865-2665. Providers update this record themselves, so call before visiting.
How can I verify Mark W. Walker, FNP-C's license?
NPPES lists Colorado license number C-APN.0992626-C-NP, as entered by the provider. Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
How much does Mark W. Walker, FNP-C prescribe under Medicare Part D?
In 2024, Mark W. Walker, FNP-C had 209 Medicare Part D claims for 87 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.