NPPES file of Aug 9, 2026

Alexander M. Villareal, M.D.

Sleep Medicine (Internal Medicine) Physician · La Crosse, WI

Alexander M. Villareal, M.D. is a sleep medicine (internal medicine) physician with a practice address in La Crosse, Wisconsin, and NPI 1609094457, issued on Apr 24, 2007. Check the license (Wisconsin 57998, as entered in NPPES) on the Wisconsin Medical Examining Board; 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
1609094457
Name
Alexander M. Villareal
Credential
M.D.
Primary taxonomy
Sleep Medicine (Internal Medicine) Physician 207RS0012X
License numbers
57998 WI
MD431468 PA
Self-reported in NPPES; status is on the state search
Practice location
1836 South Ave, La Crosse, WI 54601
Phone
(608) 782-7300
Enumerated
Apr 24, 2007
Record last updated
Apr 29, 2016 (not updated in 10 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20130123000568); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
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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8 nearest sleep medicine (internal medicine) physician records → All 27 in Wisconsin → Look up another NPI →

Also registered at 1836 South Ave

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

  1. Frank Aberger, MDGastroenterology Physician1396748711
  2. Bradley Abicht, DPMPodiatrist1962632166
  3. Carter Abicht, DOAnesthesiology Physician1932736642
  4. Grace AbichtCertified Registered Nurse Anesthetist1003651555
  5. Paul Abicht, CRNACertified Registered Nurse Anesthetist1528061843
  6. Mateen Abidi, M.DCardiovascular Disease Physician1730333980

Verify Alexander M. Villareal in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 57998    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
Open the Wisconsin license search

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40% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024

350 Medicare Part D claims for 67 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 13 claims were for opioids.

  1. Alexander Villareal350
  2. Specialty average585

Most prescribed

  1. Methylphenidate Hcl50 claims
  2. Gabapentin36 claims
  3. Clonazepam34 claims
  4. Armodafinil29 claims
  5. Modafinil29 claims
  6. Sunosi25 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 4 group practices

  1. Gundersen Clinic LtdViroqua, WI
  2. Gundersen Lutheran Medical Center IncLa Crosse, WI
  3. Saint Elizabeths Hospital OF Wabasha IncLa Crosse, WI
  4. Southwest Health Center IncPlatteville, WI

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

Alexander M. Villareal among 27 sleep medicine (internal medicine) physician records in Wisconsin

Alexander M. Villareal, M.D. is one of 27 sleep medicine (internal medicine) physician records with a practice address in Wisconsin. 85% 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 44% of them.

  • NPI issued2007 · 44% of these records are older, 44% newer
  • In a Medicare fileYes · 85% of these records are
  • In the CMS Doctors and Clinicians fileYes · 63% of these records are
  • Graduated1999 · median 2001 among the 17 with a school on file
  • Record last updated2016 · 44% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RS0012X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Sleep Medicine (Internal Medicine) Physician providers in Wisconsin

There are 27 sleep medicine (internal medicine) physician records in Wisconsin.

All 27 in Wisconsin → Every provider in La Crosse → Sleep Medicine (Internal Medicine) Physician nationwide →

The 8 sleep medicine (internal medicine) physician records with the nearest ZIP codes

  1. Allen Foster, MDLa Crosse, WI 546011043261399
  2. Daren Tobert, MDLa Crosse, WI 546011962406728
  3. Amit Gupta, M.D.Green Bay, WI 543111679991277
  4. James Gapinski, MDGreen Bay, WI 543081922114768
  5. Ethan Emmons, MDGreen Bay, WI 543011265416325
  6. Deane Franso, M.D.Green Bay, WI 543011407122906
  7. Kabir Ahmed, M.D.Fond Du Lac, WI 549351528325891
  8. Nazi Khan, MDColumbus, WI 539251225004245

Common questions

What is Alexander M. Villareal, M.D.'s NPI number?

Alexander M. Villareal, M.D.'s National Provider Identifier (NPI) is 1609094457, issued on Apr 24, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Alexander M. Villareal, M.D. located?

The NPPES record lists a practice address at 1836 South Ave, La Crosse, WI, 54601. Phone: (608) 782-7300. Providers update this record themselves, so call before visiting.

How can I verify Alexander M. Villareal, M.D.'s license?

NPPES lists Wisconsin license number 57998, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Alexander M. Villareal, M.D. prescribe under Medicare Part D?

In 2024, Alexander M. Villareal, M.D. had 350 Medicare Part D claims for 67 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.