Dr. John Thaddeus Decker, MD
- Medicare services, 2024
- 45
- Medicare patients, 2024
- 43
- Part D claims, 2024
- 168
- Industry payments
- $1,400
- Affiliated sites
- 3
- Practice address
- 6565 E. Carondelet Dr., Tucson, AZ 85710
- Practice phone
- Call (520) 392-7500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Genesis OBGYN Harmony
Mammography / Breast Imaging Center · Tucson, Arizona
Find Dr. Decker's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Thaddeus Decker is an OB-GYN in Tucson, Arizona
Dr. Decker practices at Genesis OBGYN Harmony in Tucson, Arizona.
Dr. Decker's NPI, 1578512257, was assigned on May 9, 2006. Dr. Decker graduated from University of Arizona College of Medicine in 1996. Dr. Decker holds Arizona license 25939.
- NPI
- 1578512257NPI Registry (opens in a new tab)
- NPI enumeration date
- May 9, 2006
- NPI status
- Active
- Practice phone
- (520) 392-7500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. John Thaddeus Decker practices at Genesis OBGYN Harmony in Tucson, Arizona
Dr. Decker's primary practice is Genesis OBGYN Harmony, at 6565 E. Carondelet Dr., Tucson, AZ 85710. The practice phone is (520) 392-7500.
- Genesis OBGYN Harmony6565 E. Carondelet Dr., Tucson, AZ 85710Phone(520) 392-7500
Source: Dmand AI Affiliation Data
Dr. John Thaddeus Decker is affiliated with 3 sites of care and 2 medical groups
Dr. Decker's primary practice is Genesis OBGYN Harmony in Tucson, Arizona. The medical group on file is Genesis OBGYN. Dmand AI also links Dr. Decker to 2 more group practices and clinics and 1 medical group, each named with a free account. Dr. Decker's employer is on file too: a breast imaging center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Thaddeus Decker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Decker practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Genesis OBGYN Harmony | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Thaddeus Decker is one of 654 OB-GYNs in Arizona
Obstetrics and gynecology is Dr. Decker's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Decker is licensed in Arizona.
Specialties and state licenses
- Obstetrics and gynecology, ArizonaPrimary
OB-GYNs near Dr. Decker
Counts of OB-GYNs with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Thaddeus Decker billed Medicare for 45 services in 2024
CMS data shows 45 Medicare services from Dr. Decker across 3 procedure codes in 2024, for 43 Medicare patients. Medicare paid $1,918 for them. Every service was in an office.
Dr. Decker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 472024: 3134%
- Office and hospital visits
- 2023: 172024: 1418%
Dr. Decker compared with the Arizona median for OB-GYNs, 2024
- Dr. Decker
- Arizona median
- Medicare services
- 45vs 45Close to median
- Medicare patients
- 43vs 407% above
- Part D claims
- 60vs 262.3 times
Medians across 532 OB-GYNs in Arizona with Dmand AI profiles that report each measure.
Dr. Decker's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Decker and other OB-GYNs in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Thaddeus Decker treated 43 Medicare patients in 2024, average age 71
CMS counts 43 Medicare patients who saw Dr. Decker in 2024. The largest group is 65 to 74, with 27 patients. 75% of them have high cholesterol, and 56% have high blood pressure. Their average risk score is 0.70, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Decker's median patient age at 38, with 98% women.
Dr. Decker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Decker's Medicare patients, 2024
- High cholesterol75%
- High blood pressure56%
- Arthritis42%
- Osteoporosis37%
- Mood disorders26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Decker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women98%
- Men2%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Thaddeus Decker wrote 168 Medicare Part D claims in 2024
In 2024, Dr. Decker wrote 168 Medicare Part D claims for 48 patients. 92% of them were for generic drugs. CMS names the drug for 60 of them, across 2 drugs with 11 or more claims each, at $4,582 in total drug cost. In 2023, CMS named 83 claims across 4 drugs.
Dr. Decker's Part D claims by kind of drug, 2024
- Generic154 claims92%
- Brand-name14 claims8%
Dr. Decker's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Decker's Part D claims, 2024
- Antibiotics14%23 of 168 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 832024: 6028%
Drugs named by CMS: 2 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. John Thaddeus Decker received $1,400 in industry payments from 2016 to 2025
CMS Open Payments shows 68 general payments to Dr. Decker from 21 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 90% of the total. Sumitomo Pharma America, Inc. paid the most, $233.
General payments to Dr. Decker by program year, 2016 to 2025
General payments to Dr. Decker by kind, 2016 to 2025
- Food and beverage$1,26390%
- Education$13710%
Companies that paid Dr. Decker the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Thaddeus Decker graduated from University of Arizona College of Medicine
Dr. Decker graduated from University of Arizona College of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John Thaddeus Decker's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Thaddeus Decker
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Thaddeus Decker's NPI number?
Dr. John Thaddeus Decker's NPI number is 1578512257. It was assigned on May 9, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Thaddeus Decker?
Dr. John Thaddeus Decker is an OB-GYN in Tucson, Arizona. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. John Thaddeus Decker practice?
Dr. Decker practices at 6565 E. Carondelet Dr., Tucson, AZ 85710. Dr. Decker's primary practice is Genesis OBGYN Harmony in Tucson, Arizona. Dmand AI also links Dr. Decker to 2 group practices and clinics and 1 medical group.
What is Dr. John Thaddeus Decker's office phone number?
The practice phone on file for Dr. Decker is (520) 392-7500.
What is Dr. John Thaddeus Decker's medical license number?
Dr. Decker holds Arizona license 25939.
What medical group is Dr. John Thaddeus Decker part of?
Dr. Decker is linked to Genesis OBGYN. Dmand AI links Dr. Decker to 1 more medical group.
Does Dr. John Thaddeus Decker accept Medicare?
Yes. CMS data shows Dr. Decker billed Medicare for 45 services in 2024.
How many Medicare patients does Dr. John Thaddeus Decker see?
CMS counts 43 Medicare patients who saw Dr. Decker in 2024, with an average age of 71.
What services does Dr. John Thaddeus Decker bill to Medicare?
In 2024, Dr. Decker's most billed Medicare services were medicare service (G0101), office visit, established patient (99213) and medicare temporary code (Q0091).
Where did Dr. John Thaddeus Decker go to medical school?
Dr. Decker graduated from University of Arizona College of Medicine in 1996.
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What drugs does Dr. John Thaddeus Decker prescribe most?
In 2024 Medicare Part D data, Dr. Decker's most prescribed drugs by claims were Estradiol and Progesterone.
Has Dr. John Thaddeus Decker received payments from drug or device companies?
CMS Open Payments shows $1,400 in general payments to Dr. Decker from 21 companies from 2016 to 2025. The largest total came from Sumitomo Pharma America, Inc.
How long has Dr. John Thaddeus Decker been practicing?
Dr. Decker graduated from medical school in 1996, 30 years ago.
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