NPPES file of Aug 9, 2026

William Leon Janik, CRNP

Adult Health Nurse Practitioner · Bethesda, MD

William Leon Janik, CRNP is an adult health nurse practitioner with a practice address in Bethesda, Maryland, and NPI 1497016166, issued on May 30, 2012. Check the license (Maryland R170988, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1497016166
Name
William Leon Janik
Credential
CRNP
Primary taxonomy
Adult Health Nurse Practitioner 363LA2200X
License number
R170988 MD
Self-reported in NPPES; status is on the state search
Practice location
8600 Old Georgetown RD, Bethesda, MD 20814
Phone
(301) 896-2578
Enumerated
May 30, 2012
Record last updated
May 30, 2012 (not updated in 14 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest adult health nurse practitioner records → All 902 in Maryland → Look up another NPI →

Also registered at 8600 Old Georgetown RD

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

  1. Daniel Abate, PHARMDCritical Care Pharmacist1639096654
  2. Sanjay Agarwal, MDHospitalist Physician1346200391
  3. May Alattar, MDEndocrinology, Diabetes & Metabolism Physician1154523371
  4. Alessandro Albano, MDAnesthesiology Physician1124604566
  5. Richard Alcorta, MDEmergency Medicine Physician1720023203
  6. Sara Alehashemi, MDInternal Medicine Physician1134409287

Verify William Leon Janik in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Maryland board licenses this profession
    Search for license R170988    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 Maryland license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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William Leon Janik among 902 adult health nurse practitioner records in Maryland

William Leon Janik, CRNP is one of 902 adult health nurse practitioner records with a practice address in Maryland. 63% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2012, is newer than 49% of them.

  • NPI issued2012 · 49% of these records are older, 47% newer
  • In a Medicare fileNo · 63% of these records are
  • In the CMS Doctors and Clinicians fileNo · 43% of these records are
  • Record last updated2012 · 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 363LA2200X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Adult Health Nurse Practitioner providers in Maryland

There are 902 adult health nurse practitioner records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 902 in Maryland → Every provider in Bethesda → Adult Health Nurse Practitioner nationwide →

The 8 adult health nurse practitioner records with the nearest ZIP codes

  1. Karen Adams, DNPBethesda, MD 208141275070534
  2. Jun Bie, CRNPBethesda, MD 208141396150504
  3. Carolyn Buppert, CRNPBethesda, MD 208141740283373
  4. Molly Carr, CRNPBethesda, MD 208141013225465
  5. Judy Chan, NPBethesda, MD 208141639390214
  6. Molly Clay, CRNP-ABethesda, MD 208141912263294
  7. Yvonne D'Arcy, CRNPBethesda, MD 208141174741979
  8. Cody Legler, DNP, NP-BCBethesda, MD 208141457818841

Common questions

What is William Leon Janik, CRNP's NPI number?

William Leon Janik, CRNP's National Provider Identifier (NPI) is 1497016166, issued on May 30, 2012. An NPI identifies a provider in billing; it is not a license.

Where is William Leon Janik, CRNP located?

The NPPES record lists a practice address at 8600 Old Georgetown RD, Bethesda, MD, 20814. Phone: (301) 896-2578. Providers update this record themselves, so call before visiting.

How can I verify William Leon Janik, CRNP's license?

NPPES lists Maryland license number R170988, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity 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. 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.