John Hasychak, DO
Family Medicine Physician · Nashua, NH
John Hasychak, DO is a family medicine physician with a practice address in Nashua, New Hampshire, and NPI 1568858959, issued on Apr 13, 2015. Check the license (New Hampshire 18736, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- John Hasychak
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 18736 NH
Self-reported in NPPES; status is on the state search - Practice location
- 8 Prospect St, Nashua, NH 03060
- Phone
- (603) 577-2045
- Enumerated
- Apr 13, 2015
- Record last updated
- Feb 1, 2024
- Medicare enrollment
- Enrolled (PECOS I20180813001856); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2015
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 816 in New Hampshire → Look up another NPI →
Also registered at 8 Prospect St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Hasychak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 18736Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 2 group practices
- Apogee Medical Group New Hampshire PCNashua, NH
- Foundation Medical Partners IncNashua, NH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Hasychak among 816 family medicine physician records in New Hampshire
John Hasychak, DO is one of 816 family medicine physician records with a practice address in New Hampshire. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 79% of them.
- NPI issued2015 · 79% of these records are older, 19% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2015 · median 2003 among the 498 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
41 family medicine physician records list a practice address in Nashua
They are 41 of the 3,140 NPPES records with a practice address in Nashua, and 816 family medicine physician records in New Hampshire.
All 816 in New Hampshire → Every provider in Nashua → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Karin Adelman, M.D.Nashua, NH 030601982674354
- Kathleen Corrigan, MDNashua, NH 030601871542423
- Jennifer Funaioli-Sheehan, D.O.Nashua, NH 030601609816966
- Birgit Houston, M.D.Nashua, NH 030601881664274
- Shanta Mahmudi, MDNashua, NH 030601528061637
- Harry McKinnon, MDNashua, NH 030601144210410
- Elizabeth McMillan, M.D.Nashua, NH 030601699877134
- Mark Messier, MDNashua, NH 030601104933035
Common questions
What is John Hasychak, DO's NPI number?
John Hasychak, DO's National Provider Identifier (NPI) is 1568858959, issued on Apr 13, 2015. An NPI identifies a provider in billing; it is not a license.
Where is John Hasychak, DO located?
The NPPES record lists a practice address at 8 Prospect St, Nashua, NH, 03060. Phone: (603) 577-2045. Providers update this record themselves, so call before visiting.
How can I verify John Hasychak, DO's license?
NPPES lists New Hampshire license number 18736, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.