$45,002 in research paymentsLupus Erythematosus, SystemicConnective Tissue DiseasesUpadacitinib
Dr. Joan T. Merrill, MD
NPI1962471813
- Part D claims, 2019
- 41
- Clinical trials
- 4
- Industry payments
- $995,072
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 825 Ne 13th St, Oklahoma City, OK 73104-5005
- Practice phone
- Call (405) 271-7805
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Merrill's professional email, personal email and mobile number
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Dr. Joan T. Merrill is a rheumatologist in Oklahoma City, Oklahoma
Dr. Merrill practices in Oklahoma City, Oklahoma.
Dr. Merrill's NPI, 1962471813, was assigned on March 14, 2006. Dr. Merrill holds Oklahoma license 22229.
NPI and contact details
- NPI
- 1962471813NPI Registry (opens in a new tab)
- NPI enumeration date
- March 14, 2006
- NPI status
- Active
- Practice phone
- (405) 271-7805
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Joan T. Merrill's practice address is in Oklahoma City, Oklahoma
Dr. Merrill's practice address in the NPI Registry is 825 Ne 13th St, Oklahoma City, OK 73104-5005. The practice phone is (405) 271-7805.
- NPI Registry address825 Ne 13th St, Oklahoma City, OK 73104-5005Phone(405) 271-7805
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Joan T. Merrill's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Merrill practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Merrill's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Joan T. Merrill is one of 61 rheumatologists in Oklahoma
Rheumatology is Dr. Merrill's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. Merrill is licensed in Oklahoma.
Specialties and state licenses
- Rheumatology, OklahomaPrimary
Rheumatologists near Dr. Merrill
Counts of rheumatologists 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. Joan T. Merrill's patients have a median age of 74
Across all payers, Dmand AI patient panel data puts Dr. Merrill's median patient age at 74, with 100% women.
Dr. Merrill's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Joan T. Merrill wrote 41 Medicare Part D claims in 2019
In 2019, Dr. Merrill wrote 41 Medicare Part D claims. Every claim was for a generic drug. They cover 3 drugs, with $2,014 in total drug cost. In 2016, CMS named 29 claims across 1 drug.
Part D claims, 201941
Drugs named by CMS3
Total drug cost$2,014
Dr. Merrill's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2016 to 2019
- 2016
- 2019
- Claims for drugs CMS names
- 2016: 292019: 4141%
Drugs named by CMS: 3 in 2019, 1 in 2016.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Joan T. Merrill has worked on 4 clinical trials
Dmand AI links Dr. Merrill to 4 clinical trials. 2 are still active or recruiting. Conditions studied include Lupus Erythematosus, Systemic, Connective Tissue Diseases and Arthritis, Rheumatoid. AbbVie sponsors the most, 3. Open Payments lists research payments to Dr. Merrill that name 4 trials.
Conditions in Dr. Merrill's trials
- Lupus Erythematosus, Systemic
- Connective Tissue Diseases
- Arthritis, Rheumatoid
- Rheumatic Diseases
Investigators on the most trials with Dr. Merrill
- Ira F. Fenton, DO2 shared trials
- John M. Joseph, MD2 shared trials
- Cynthia B. Aranow, MD1 shared trial
Recent clinical trials with Dr. Merrill
$16,635 in research paymentsLupus Erythematosus, SystemicConnective Tissue DiseasesSAR441344 IVSAR441344 SC
$212,224 in research paymentsLupus Erythematosus, SystemicConnective Tissue DiseasesElsubrutinibUpadacitinib
$28,631 in research paymentsArthritis, RheumatoidRheumatic DiseasesUpadacitinibElsubrutinib
Sources: Open Payments (CMS), 2025 data, released July 7, 2026; ClinicalTrials.gov (National Library of Medicine); and Dmand AI Research Linkage
Dr. Joan T. Merrill received $995,072 in industry payments from 2016 to 2025
CMS Open Payments shows 347 general payments to Dr. Merrill from 21 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 96% of the total. Amgen Inc. paid the most, $206,954. It also lists 110 research payments totaling $343,846 from 2016 to 2025, naming 4 clinical trials.
General payments to Dr. Merrill by program year, 2016 to 2025
General payments to Dr. Merrill by kind, 2016 to 2025
$995.1Kin total
- Consulting fees$951,40996%
- Travel and lodging$31,5293%
- Speaker and faculty fees$5,2141%
- Food and beverage$4,8620%
- Other$2,0570%
Companies that paid Dr. Merrill the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Joan T. Merrill'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Clinical trials and co-investigators | ClinicalTrials.gov (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Joan T. Merrill
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. Joan T. Merrill's NPI number?
Dr. Joan T. Merrill's NPI number is 1962471813. It was assigned on March 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Joan T. Merrill?
Dr. Joan T. Merrill is a rheumatologist in Oklahoma City, Oklahoma. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. Joan T. Merrill practice?
Dr. Merrill practices at 825 Ne 13th St, Oklahoma City, OK 73104-5005.
What is Dr. Joan T. Merrill's office phone number?
The practice phone on file for Dr. Merrill is (405) 271-7805.
What is Dr. Joan T. Merrill's medical license number?
Dr. Merrill holds Oklahoma license 22229.
What drugs does Dr. Joan T. Merrill prescribe most?
In 2019 Medicare Part D data, Dr. Merrill's most prescribed drugs by claims were Prednisone, Alendronate Sodium and Cevimeline HCl.
Has Dr. Joan T. Merrill received payments from drug or device companies?
CMS Open Payments shows $995,072 in general payments to Dr. Merrill from 21 companies from 2016 to 2025. The largest total came from Amgen Inc.
How long has Dr. Joan T. Merrill been practicing?
Dr. Merrill's NPI was assigned in 2006.
Does Dr. Joan T. Merrill do research?
Dr. Merrill has worked on 4 clinical trials.
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