Naia McMillan-Castanares
Sleep Medicine (Internal Medicine) Physician · Ann Arbor, MI
Naia McMillan-Castanares is a sleep medicine (internal medicine) physician with a practice address in Ann Arbor, Michigan, and NPI 1558931196, issued on Jun 27, 2021. Check the license (Michigan 4301513679, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Naia McMillan-Castanares
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- 4301513679 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1500 E Medical Center Dr, Ann Arbor, MI 48109
- Phone
- (734) 936-9068
- Enumerated
- Jun 27, 2021
- Record last updated
- Jul 11, 2025
- Entity
- Type 1 · individual
8 nearest sleep medicine (internal medicine) physician records → All 52 in Michigan → Look up another NPI →
Also registered at 1500 E Medical Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Naia McMillan-Castanares in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301513679Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
375 Medicare Part D claims for 29 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D.
Most prescribed
- Metformin Hcl38 claims
- Amlodipine Besylate24 claims
- Losartan Potassium19 claims
- Atorvastatin Calcium18 claims
- Pantoprazole Sodium15 claims
- Jardiance14 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.
Naia McMillan-Castanares among 52 sleep medicine (internal medicine) physician records in Michigan
Naia McMillan-Castanares is one of 52 sleep medicine (internal medicine) physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 92% of them.
- NPI issued2021 · 92% of these records are older, 4% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2025 · 52% 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 Michigan 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 Michigan
There are 52 sleep medicine (internal medicine) physician records in Michigan.
All 52 in Michigan → Every provider in Ann Arbor → Sleep Medicine (Internal Medicine) Physician nationwide →
The 8 sleep medicine (internal medicine) physician records with the nearest ZIP codes
- Paul ChoAnn Arbor, MI 481091255074704
- Bradley Graves, MDAnn Arbor, MI 481091548825086
- Qurratul Shamim-Uzzaman, MDAnn Arbor, MI 481091043498058
- Eby Thekkedath, DOAnn Arbor, MI 481091063973659
- Xinhang Tu, BMAnn Arbor, MI 481091922615715
- Tri Nguyen, DOAnn Arbor, MI 481051265938120
- Gary Richardson, M.D.Ann Arbor, MI 481041700945045
- Allen Denys, M.D.Warren, MI 480881386847507
Common questions
What is Naia McMillan-Castanares's NPI number?
Naia McMillan-Castanares's National Provider Identifier (NPI) is 1558931196, issued on Jun 27, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Naia McMillan-Castanares located?
The NPPES record lists a practice address at 1500 E Medical Center Dr, Ann Arbor, MI, 48109. Phone: (734) 936-9068. Providers update this record themselves, so call before visiting.
How can I verify Naia McMillan-Castanares's license?
NPPES lists Michigan license number 4301513679, 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 Naia McMillan-Castanares prescribe under Medicare Part D?
In 2024, Naia McMillan-Castanares had 375 Medicare Part D claims for 29 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.
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.