NPPES file of Aug 9, 2026

Richard John Mastenbrook, CNP

Nurse Practitioner · Chisago City, MN

Richard John Mastenbrook, CNP is a nurse practitioner with a practice address in Chisago City, Minnesota, and NPI 1619386083, issued on Aug 10, 2014. Check the license (Minnesota AG0714121, as entered in NPPES) with the Minnesota board that licenses this profession; 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
1619386083
Name
Richard John Mastenbrook
Credential
CNP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
AG0714121 MN
Self-reported in NPPES; status is on the state search
Practice location
11725 Stinson Ave, Chisago City, MN 55013
Phone
(651) 257-8850
Enumerated
Aug 10, 2014
Record last updated
Aug 11, 2022
Fax
(651) 257-8852
Medicare enrollment
Enrolled (PECOS I20141202001220); accepts Medicare assignment
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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Also registered at 11725 Stinson Ave

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

  1. Nancy Alexis, MDFamily Medicine Physician1508818717
  2. Amy Anderson, MDFamily Medicine Physician1881630549
  3. Jessica Babcock, PA-CPhysician Assistant1043504749
  4. Thomas Gustafson, M.D.Sleep Medicine (Family Medicine) Physician1225253693
  5. Anna Johnson, ATCAthletic Trainer1760402879
  6. Kim Johnson, PTPhysical Therapist1215008578

Verify Richard John Mastenbrook in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Minnesota board licenses this profession
    Search for license AG0714121    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
Find the Minnesota license search

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5.1 times the Medicare Part D claims of the average nurse practitioner in 2024

5,624 Medicare Part D claims for 314 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. 195 claims were for opioids.

  1. Richard Mastenbrook5,624
  2. Specialty average1,109

Most prescribed

  1. Furosemide277 claims
  2. Gabapentin241 claims
  3. Levothyroxine Sodium217 claims
  4. Eliquis208 claims
  5. Sertraline Hcl189 claims
  6. Atorvastatin Calcium162 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. Fairview ClinicsEagan, MN

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

1 nurse practitioner records list a practice address in Chisago City

They are 1 of the 57 NPPES records with a practice address in Chisago City, and 2,582 nurse practitioner records in Minnesota.

All 2,582 in Minnesota → Every provider in Chisago City →

Other nurse practitioner records in Minnesota

  1. Lori Aasen, CNPRochester, MN1326336405
  2. Rosalind Abara, RN, MSN, PHD, CRNPMinnetonka, MN1821244740
  3. Halimat AbdulganiyuSaint Paul, MN1265322820
  4. Elizabeth AbellSt Louis Park, MN1568777274
  5. Caroline Abenakyo, FNP-CMinneapolis, MN1164932570
  6. Emily Abernethy, NPDuluth, MN1568089340
  7. Fte-Hudani AchingeSaint Paul, MN1790631844
  8. Jessica Acker, FNP-CStillwater, MN1124794425
  9. Cassandra Ackerman, MSN, APRN, FNP-CSaint Cloud, MN1205435773
  10. Ashley AdamsMinneapolis, MN1083275416

Common questions

What is Richard John Mastenbrook, CNP's NPI number?

Richard John Mastenbrook, CNP's National Provider Identifier (NPI) is 1619386083, issued on Aug 10, 2014. An NPI identifies a provider in billing; it is not a license.

Where is Richard John Mastenbrook, CNP located?

The NPPES record lists a practice address at 11725 Stinson Ave, Chisago City, MN, 55013. Phone: (651) 257-8850. Providers update this record themselves, so call before visiting.

How can I verify Richard John Mastenbrook, CNP's license?

NPPES lists Minnesota license number AG0714121, as entered by the provider. Search the Minnesota board that licenses this profession; the NPPES record confirms identity only.

How much does Richard John Mastenbrook, CNP prescribe under Medicare Part D?

In 2024, Richard John Mastenbrook, CNP had 5,624 Medicare Part D claims for 314 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.