Jacob Guiser
Psychiatry Physician · Grand Rapids, MI
Jacob Guiser is a psychiatry physician with a practice address in Grand Rapids, Michigan, and NPI 1891483426, issued on May 1, 2023. Check the license (Michigan 4351050971APP23, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Jacob Guiser
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 4351050971APP23 MI
Self-reported in NPPES; status is on the state search - Practice location
- 300 68TH St SE, Grand Rapids, MI 49548
- Phone
- (616) 456-0857
- Enumerated
- May 1, 2023
- Record last updated
- May 3, 2023
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 1,729 in Michigan → Look up another NPI →
Also registered at 300 68TH St SE
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kyle AhonenChild & Adolescent Psychiatry Physician1326579426
Verify Jacob Guiser in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4351050971APP23Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average psychiatry physician in 2024
64 Medicare Part D claims for 17 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
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.
Jacob Guiser among 1,729 psychiatry physician records in Michigan
Jacob Guiser is one of 1,729 psychiatry physician records with a practice address in Michigan. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 91% of them.
- NPI issued2023 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · 48% of these records are
- Record last updated2023 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
206 psychiatry physician records list a practice address in Grand Rapids
They are 206 of the 18,005 NPPES records with a practice address in Grand Rapids, and 1,729 psychiatry physician records in Michigan.
All 1,729 in Michigan → Every provider in Grand Rapids → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Eric Achtyes, MDGrand Rapids, MI 495481780665976
- Jaime Ayala, M.D.Grand Rapids, MI 495481235180720
- William Beute, M.D.Grand Rapids, MI 495481093761827
- Eric Erickson, DOGrand Rapids, MI 495481558342220
- Jeffrey Jackson, MDGrand Rapids, MI 495481598711186
- Robert Lafleur, D.O.Grand Rapids, MI 495481043260177
- Jack Mahdasian, MDGrand Rapids, MI 495481841246634
- Carlos Marcano, MDGrand Rapids, MI 495481639125040
Common questions
What is Jacob Guiser's NPI number?
Jacob Guiser's National Provider Identifier (NPI) is 1891483426, issued on May 1, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Jacob Guiser located?
The NPPES record lists a practice address at 300 68TH St SE, Grand Rapids, MI, 49548. Phone: (616) 456-0857. Providers update this record themselves, so call before visiting.
How can I verify Jacob Guiser's license?
NPPES lists Michigan license number 4351050971APP23, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jacob Guiser prescribe under Medicare Part D?
In 2024, Jacob Guiser had 64 Medicare Part D claims for 17 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.