Walter John Nieri, M.D.
Geriatric Medicine (Internal Medicine) Physician · Phoenix, AZ
Walter John Nieri, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Phoenix, Arizona, and NPI 1265488258, issued on May 25, 2006. Check the license (Arizona 6055, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Walter John Nieri
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 6055 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 6510 N 27TH St, Phoenix, AZ 85016
- Phone
- (602) 885-1988
- Enumerated
- May 25, 2006
- Record last updated
- Feb 24, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (602) 951-9750
- Medicare enrollment
- Enrolled (PECOS I20070814000568); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 65 in Arizona → Look up another NPI →
Verify Walter John Nieri in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 6055Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
1,459 Medicare Part D claims for 106 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. 40 claims were for opioids.
Most prescribed
- Levothyroxine Sodium96 claims
- Citalopram Hbr81 claims
- Donepezil Hcl79 claims
- Atorvastatin Calcium76 claims
- Quetiapine Fumarate69 claims
- Omeprazole61 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.
Industry payments in 2024: $35.54
1 payment: food and beverage; the largest payer was Lilly USA, LLC. The 1,004 providers of this specialty with any payment received $1,720.82 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Banner Hospital Based Physicians Arizona LLCSun City, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter John Nieri among 65 geriatric medicine (internal medicine) physician records in Arizona
Walter John Nieri, M.D. is one of 65 geriatric medicine (internal medicine) physician records with a practice address in Arizona. 60% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 31% newer
- In a Medicare fileYes · 60% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated1968 · median 1998 among the 27 with a school on file
- Record last updated2009 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Arizona
There are 65 geriatric medicine (internal medicine) physician records in Arizona.
All 65 in Arizona → Every provider in Phoenix → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Maria Bellantoni, MDPhoenix, AZ 850161689162307
- Kehart Flom RacomaPhoenix, AZ 850161962067363
- Cheri Pott, MDPhoenix, AZ 850161417225426
- Talissa Adkison, M.DPhoenix, AZ 850141114040862
- Leslie Dunn, DOPhoenix, AZ 850121689759557
- Venu Gopal, MDPhoenix, AZ 850121003853912
- Suzanne Combs, DOPhoenix, AZ 850211790745503
- Andrew March, M.D.Phoenix, AZ 850211700850922
Common questions
What is Walter John Nieri, M.D.'s NPI number?
Walter John Nieri, M.D.'s National Provider Identifier (NPI) is 1265488258, issued on May 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter John Nieri, M.D. located?
The NPPES record lists a practice address at 6510 N 27TH St, Phoenix, AZ, 85016. Phone: (602) 885-1988. Providers update this record themselves, so call before visiting.
How can I verify Walter John Nieri, M.D.'s license?
NPPES lists Arizona license number 6055, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Walter John Nieri, M.D. prescribe under Medicare Part D?
In 2024, Walter John Nieri, M.D. had 1,459 Medicare Part D claims for 106 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.