NPPES file of Aug 9, 2026

Ruth Bautista Diaz, M.D.

Psychiatry Physician · Ypsilanti, MI

Ruth Bautista Diaz, M.D. is a psychiatry physician with a practice address in Ypsilanti, Michigan, and NPI 1801941281, issued on Jan 24, 2007. Check the license (Michigan 4301035476, as entered in NPPES) on the Michigan Board of Medicine (LARA); 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
1801941281
Name
Ruth Bautista Diaz
Credential
M.D.
Primary taxonomy
Psychiatry Physician 2084P0800X
License number
4301035476 MI
Self-reported in NPPES; status is on the state search
Practice location
4870 W Clark RD, Ypsilanti, MI 48197
Phone
(734) 434-7260
Enumerated
Jan 24, 2007
Record last updated
Sep 9, 2021 (not updated in 5 years: call before relying on the address or phone)
Fax
(734) 434-7607
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 psychiatry physician records → All 1,729 in Michigan → Look up another NPI →

Also registered at 4870 W Clark RD

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

  1. Jordan Else, AGPCNP-BCNurse Practitioner1821497116
  2. Charles Krasnow, M.D.Psychiatry Physician1861650137
  3. Michael Simon, MDAllergy Physician1740396951

Verify Ruth Bautista Diaz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
    Search for license 4301035476    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 Michigan license search

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98% fewer Medicare Part D claims than the average psychiatry physician in 2024

15 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.

  1. Ruth Diaz15
  2. Specialty average1,000

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.

Ruth Bautista Diaz among 1,729 psychiatry physician records in Michigan

Ruth Bautista Diaz, M.D. 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 2007, is newer than 37% of them.

  • NPI issued2007 · 37% of these records are older, 49% newer
  • In a Medicare fileYes · 69% of these records are
  • In the CMS Doctors and Clinicians fileNo · 48% of these records are
  • Record last updated2021 · 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).

Psychiatry Physician providers in Michigan

There are 1,729 psychiatry physician records in Michigan.

All 1,729 in Michigan → Every provider in Ypsilanti → Psychiatry Physician nationwide →

The 8 psychiatry physician records with the nearest ZIP codes

  1. Etienne Dehoorne, MDYpsilanti, MI 481971972654267
  2. Angela Demehri, M.D.Ypsilanti, MI 481971588975767
  3. Shama Faheem, M.D.Ypsilanti, MI 481971962792218
  4. Timothy Florence, MDYpsilanti, MI 481971649342858
  5. Kim Horn, M.D.Ypsilanti, MI 481971497778617
  6. Charles Krasnow, M.D.Ypsilanti, MI 481971861650137
  7. Fatin Nahi, MDYpsilanti, MI 481971912124249
  8. Diana Nistor, M.D.Ypsilanti, MI 481971992845341

Common questions

What is Ruth Bautista Diaz, M.D.'s NPI number?

Ruth Bautista Diaz, M.D.'s National Provider Identifier (NPI) is 1801941281, issued on Jan 24, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Ruth Bautista Diaz, M.D. located?

The NPPES record lists a practice address at 4870 W Clark RD, Ypsilanti, MI, 48197. Phone: (734) 434-7260. Providers update this record themselves, so call before visiting.

How can I verify Ruth Bautista Diaz, M.D.'s license?

NPPES lists Michigan license number 4301035476, 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 Ruth Bautista Diaz, M.D. prescribe under Medicare Part D?

In 2024, Ruth Bautista Diaz, M.D. had 15 Medicare Part D claims; 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.

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.