John Thaddeus Decker, MD
Obstetrics & Gynecology Physician · Tucson, AZ
John Thaddeus Decker, MD is an obstetrics & gynecology physician with a practice address in Tucson, Arizona, and NPI 1578512257, issued on May 9, 2006. Check the license (Arizona 25939, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Thaddeus Decker
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 25939 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 6452 E Carondelet Dr Ste 100, Tucson, AZ 85710
- Phone
- (520) 323-0333
- Enumerated
- May 9, 2006
- Record last updated
- Jun 18, 2024
- Fax
- (520) 323-5036
- Medicaid ID
- 499253 AZ
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 803 in Arizona → Look up another NPI →
Also registered at 6452 E Carondelet Dr Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Racquel Carranza, M.D.Obstetrics & Gynecology Physician1093256331
- Katy Hoeft, PA-CMedical Physician Assistant1346236882
- Cameron Kliner, MD, MSObstetrics & Gynecology Physician1245460161
- Christina Rumph, CNMAdvanced Practice Midwife1861485385
Verify John Thaddeus Decker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 25939Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
168 Medicare Part D claims for 48 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Estradiol47 claims
- Progesterone13 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: $508.96
22 payments; by number, the most common kind was food and beverage; the largest payer was Sumitomo Pharma America, Inc. The 21,429 providers of this specialty with any payment received $1,030.61 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.
John Thaddeus Decker among 803 obstetrics & gynecology physician records in Arizona
John Thaddeus Decker, MD is one of 803 obstetrics & gynecology physician records with a practice address in Arizona. 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 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2024 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Arizona
There are 803 obstetrics & gynecology physician records in Arizona.
All 803 in Arizona → Every provider in Tucson → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Melissa Bradley, D.O.Tucson, AZ 857101821292590
- Racquel Carranza, M.D.Tucson, AZ 857101093256331
- Cameron Kliner, MD, MSTucson, AZ 857101245460161
- Richard Langert, MD PCTucson, AZ 857101013911429
- David Mainman, MDTucson, AZ 857101669458840
- Kristin RyanTucson, AZ 857101073735692
- Lilia Sen, M.D.Tucson, AZ 857101144596784
- Judith Riley, MDTucson, AZ 857111073570602
Common questions
What is John Thaddeus Decker, MD's NPI number?
John Thaddeus Decker, MD's National Provider Identifier (NPI) is 1578512257, issued on May 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Thaddeus Decker, MD located?
The NPPES record lists a practice address at 6452 E Carondelet Dr Ste 100, Tucson, AZ, 85710. Phone: (520) 323-0333. Providers update this record themselves, so call before visiting.
How can I verify John Thaddeus Decker, MD's license?
NPPES lists Arizona license number 25939, 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 John Thaddeus Decker, MD prescribe under Medicare Part D?
In 2024, John Thaddeus Decker, MD had 168 Medicare Part D claims for 48 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.