Dr. Douglas Aaron Rex, DO
- Medicare services, 2024
- 378
- Medicare patients, 2024
- 245
- Part D claims, 2024
- 334
- MIPS score, 2024
- 86
- Hospital affiliations
- 1
- Practice address
- 330 N Wabash Ave, Marion, IN 46952
- Practice phone
- Call (765) 660-7600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Physicians' Billing of Mgh
Marion, Indiana
Find Dr. Rex'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. Douglas Aaron Rex is a general surgeon in Marion, Indiana
Dr. Rex practices at Physicians' Billing of Mgh in Marion, Indiana.
Dr. Rex's NPI, 1912185661, was assigned on February 5, 2008. Dr. Rex graduated from University of Pikeville, Kentucky College of Osteopathic Med in 2003. Dr. Rex holds Indiana license 02003334B.
- NPI
- 1912185661NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012083876
- NPI enumeration date
- February 5, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (765) 660-7600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Douglas Aaron Rex practices at Physicians' Billing of Mgh in Marion, Indiana
Dr. Rex's primary practice is Physicians' Billing of Mgh, at 330 N Wabash Ave, Marion, IN 46952 in Grant County. The practice phone is (765) 660-7600.
- Physicians' Billing of Mgh330 N Wabash Ave, Marion, IN 46952 · Grant CountyPhone(765) 660-7600
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Douglas Aaron Rex is affiliated with 3 sites of care and 1 medical group
Dr. Rex's primary practice is Physicians' Billing of Mgh in Marion, Indiana. Dr. Rex is also affiliated with Marion Health. The medical group on file is Physicians' Billing of Marion Health. Dmand AI also links Dr. Rex to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Douglas Aaron Rex's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Rex practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Physicians' Billing of Mgh | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Douglas Aaron Rex is one of 530 general surgeons in Indiana
Surgery is Dr. Rex's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Rex is licensed in Indiana.
Specialties and state licenses
- Surgery, IndianaPrimary
General surgeons near Dr. Rex
Counts of general surgeons 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. Douglas Aaron Rex billed Medicare for 378 services in 2024
CMS data shows 378 Medicare services from Dr. Rex across 11 procedure codes in 2024, for 245 Medicare patients. Medicare paid $37,219 for them.
Dr. Rex's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2352024: 26211%
- Surgery
- 2023: 1072024: 1168%
- Other services
- 2023: 132024: 0100%
Where Dr. Rex's Medicare services took place, 2024
- In an office24164%
- In a facility13736%
Dr. Rex compared with the Indiana median for general surgeons, 2024
- Dr. Rex
- Indiana median
- Medicare services
- 378vs 1562.4 times
- Medicare patients
- 245vs 13187% above
- Part D claims
- 258vs 406.5 times
Medians across 526 general surgeons in Indiana with Dmand AI profiles that report each measure.
Dr. Rex'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.
Need commercial claims for Dr. Rex?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Rex and other general surgeons in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Douglas Aaron Rex treated 245 Medicare patients in 2024, average age 72
CMS counts 245 Medicare patients who saw Dr. Rex in 2024. The largest group is 65 to 74, with 129 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 15% are also on Medicaid. Their average risk score is 1.25, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Rex's median patient age at 66, with 58% women.
Dr. Rex's Medicare patients by age, 2024
Dr. Rex's Medicare patients by sex, 2024
- Women13254%
- Men11346%
Chronic conditions among Dr. Rex's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis51%
- Cancer32%
- Diabetes30%
- Anxiety27%
- Ischemic heart disease27%
- Mood disorders23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Rex's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Douglas Aaron Rex wrote 334 Medicare Part D claims in 2024
In 2024, Dr. Rex wrote 334 Medicare Part D claims for 185 patients. 79% of them were for generic drugs. CMS names the drug for 258 of them, across 8 drugs with 11 or more claims each, at $10,742 in total drug cost. In 2023, CMS named 235 claims across 6 drugs.
Dr. Rex's Part D claims by kind of drug, 2024
- Generic263 claims79%
- Brand-name71 claims21%
Dr. Rex'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. Rex's Part D claims, 2024
- Opioids24%81 of 334 claims
- Antibiotics16%54 of 334 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: 2352024: 25810%
Drugs named by CMS: 8 in 2024, 6 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
Dr. Douglas Aaron Rex scored 86 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 86 out of 100 for Dr. Rex for performance year 2024, reported as part of a group. Dr. Rex accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 95 procedures of colonoscopy by Dr. Rex, more than 79% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Rex's MIPS scores, performance year 2024
- 86of 100Final score
- 71.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Rex ranks in Medicare procedure volume
- Colonoscopy
- 79th percentile95 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 64th percentile53 procedures
- Hernia repair (minimally invasive)
- 77th percentile13 procedures
- Mastectomy
- 64th percentile11 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Douglas Aaron Rex received $9,655 in industry payments from 2016 to 2025
CMS Open Payments shows 35 general payments to Dr. Rex from 7 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 41% of the total. Intuitive Surgical, Inc. paid the most, $4,400.
General payments to Dr. Rex by program year, 2016 to 2025
General payments to Dr. Rex by kind, 2016 to 2025
- Consulting fees$3,93241%
- Education$2,57027%
- Food and beverage$1,73418%
- Travel and lodging$1,41915%
Companies that paid Dr. Rex 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. Douglas Aaron Rex graduated from University of Pikeville, Kentucky College of Osteopathic Med
Dr. Rex graduated from University of Pikeville, Kentucky College of Osteopathic Med in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Douglas Aaron Rex'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 |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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. Douglas Aaron Rex
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. Douglas Aaron Rex's NPI number?
Dr. Douglas Aaron Rex's NPI number is 1912185661. It was assigned on February 5, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Douglas Aaron Rex?
Dr. Douglas Aaron Rex is a general surgeon in Marion, Indiana. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Douglas Aaron Rex practice?
Dr. Rex practices at 330 N Wabash Ave, Marion, IN 46952. Dr. Rex's primary practice is Physicians' Billing of Mgh in Marion, Indiana. Dmand AI also links Dr. Rex to 1 group practice or clinic.
What is Dr. Douglas Aaron Rex's office phone number?
The practice phone on file for Dr. Rex is (765) 660-7600.
What is Dr. Douglas Aaron Rex's medical license number?
Dr. Rex holds Indiana license 02003334B.
Which hospitals is Dr. Douglas Aaron Rex affiliated with?
Dr. Rex is affiliated with Marion Health.
What medical group is Dr. Douglas Aaron Rex part of?
Dr. Rex is linked to Physicians' Billing of Marion Health.
Does Dr. Douglas Aaron Rex accept Medicare?
Yes. CMS data shows Dr. Rex billed Medicare for 378 services in 2024, and Dr. Rex accepts Medicare assignment.
What is Dr. Douglas Aaron Rex's MIPS score?
Dr. Rex's MIPS final score for performance year 2024 is 86 out of 100, reported as part of a group.
How many Medicare patients does Dr. Douglas Aaron Rex see?
CMS counts 245 Medicare patients who saw Dr. Rex in 2024, with an average age of 72.
Show 5 more questionsShow fewer questions
What services does Dr. Douglas Aaron Rex bill to Medicare?
In 2024, Dr. Rex's most billed Medicare services were surgery: digestive system (45385), office visit, established patient (99213) and office visit, new patient (99204).
Where did Dr. Douglas Aaron Rex go to medical school?
Dr. Rex graduated from University of Pikeville, Kentucky College of Osteopathic Med in 2003.
What drugs does Dr. Douglas Aaron Rex prescribe most?
In 2024 Medicare Part D data, Dr. Rex's most prescribed drugs by claims were Sucralfate, Sutab and Hydrocodone-Acetaminophen.
Has Dr. Douglas Aaron Rex received payments from drug or device companies?
CMS Open Payments shows $9,655 in general payments to Dr. Rex from 7 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Douglas Aaron Rex been practicing?
Dr. Rex graduated from medical school in 2003, 23 years ago.
Selling to surgery practices?
See general surgeons in Indiana by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card