Dr. Douglas Aaron Rex , DO
Surgery • Marion, IN
330 N Wabash Ave, Ste G370
Marion, IN 469522678
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on February 5, 2008; this date does not establish years in practice.
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Published CMS data list 378 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 45385 — Removal of polyps or growths of large bowel using an endoscope with mechanical snare: 61 service units.
- 99213 — Established patient outpatient office visit: 56 service units.
- 99204 — New patient outpatient office visit: 52 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 11 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 258 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Sucralfate — 68 prescription fills, including refills.
- Sutab (Sod Sulf/Pot Chloride/Mag Sulf) — 48 prescription fills, including refills.
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 39 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 8 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 75% of clinicians listed under Surgery in Indiana (2024, 373 clinicians with data). Median for this group: 193. Middle half: 103 to 346.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 322 in 2020 to 378 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
330 N Wabash Ave
Ste G370
Marion, IN 469522678
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Marion General Hospital. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
University Of Pikeville, Kentucky College Of Osteopathic Med
2003
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
245 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $48,260 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $37,219 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
258 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$10,742 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $4,399.57 across 19 records.
By nature of payment
- Education: $2,500.00 across 1 record.
- Food and Beverage: $1,438.90 across 15 records.
- Travel and Lodging: $460.67 across 3 records.
Reporting-company totals
- INTUITIVE SURGICAL, INC.: $4,399.57 across 19 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
23 years (graduated 2003)
CMS Doctors and Clinicians data list 2003 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Rex has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Rex as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Marion and Indiana
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 75% of clinicians listed under Surgery in Indiana (2024, 373 clinicians with data). Median for this group: 193. Middle half: 103 to 346.
Too few clinicians listed under Surgery in Marion have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 80% of clinicians listed under Surgery in Indiana (2024, 373 clinicians with data). Median for this group: $22,506. Middle half: $11,506 to $42,445.
Too few clinicians listed under Surgery in Marion have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 80% of clinicians listed under Surgery in Indiana (2024, 373 clinicians with data). Median for this group: $17,012. Middle half: $8,969 to $31,808.
Too few clinicians listed under Surgery in Marion have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 90% of clinicians listed under Surgery in Indiana (2024, 349 clinicians with data). Median for this group: 68. Middle half: 35 to 122.
Too few clinicians listed under Surgery in Marion have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 90% of clinicians listed under Surgery in Indiana (2024, 349 clinicians with data). Median for this group: $441. Middle half: $130 to $1,955.
Too few clinicians listed under Surgery in Marion have Medicare Part D data for 2024 to compare.
9 active clinicians are listed under Surgery with a practice address in Marion, IN (614 in Indiana).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 17% from 322 in 2020 to 378 in 2024.
- 2020: 322
- 2021: 421
- 2022: 328
- 2023: 355
- 2024: 378
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Medicare-allowed amount
Medicare-allowed amount increased 28% from $37,681 in 2020 to $48,260 in 2024.
- 2020: $37,681
- 2021: $53,977
- 2022: $44,429
- 2023: $46,124
- 2024: $48,260
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Paid by Medicare
Paid by Medicare increased 30% from $28,556 in 2020 to $37,219 in 2024.
- 2020: $28,556
- 2021: $42,530
- 2022: $34,149
- 2023: $36,002
- 2024: $37,219
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 91% from 135 in 2020 to 258 in 2024.
- 2020: 135
- 2021: 147
- 2022: 102
- 2023: 235
- 2024: 258
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30-day fills
30-day fills increased 76% from 147 in 2020 to 258 in 2024.
- 2020: 147
- 2021: 149
- 2022: 102
- 2023: 237
- 2024: 258
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Part D drug cost
Part D drug cost increased 224% from $3,311 in 2020 to $10,742 in 2024.
- 2020: $3,311
- 2021: $2,461
- 2022: $3,219
- 2023: $12,335
- 2024: $10,742
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Industry payments (Open Payments)
Industry payments (Open Payments) increased 54% from $2,856.79 in 2019 to $4,399.57 in 2025.
- 2019: $2,856.79
- 2020: $25.04
- 2022: $21.55
- 2024: $23.24
- 2025: $4,399.57
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): 19 records totaling $4,399.57.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| INTUITIVE SURGICAL, INC. |
Education
In-kind items and services
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DAVINCI XI | General | $2,500.00 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $661.62 |
| INTUITIVE SURGICAL, INC. |
Travel and Lodging
In-kind items and services
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Da Vinci Surgical System | General | $386.67 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $378.34 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
|
Da Vinci Surgical System | General | $121.04 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
|
Da Vinci Surgical System | General | $78.10 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $66.12 |
| INTUITIVE SURGICAL, INC. |
Travel and Lodging
In-kind items and services
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Da Vinci Surgical System | General | $37.00 |
| INTUITIVE SURGICAL, INC. |
Travel and Lodging
In-kind items and services
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Da Vinci Surgical System | General | $37.00 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $30.05 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $28.98 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $17.72 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $16.99 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $15.86 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $8.09 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $6.55 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $3.53 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $3.03 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $2.88 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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45385
Removal of polyps or growths of large bowel using an endoscope with mechanical snare
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61 | 60 | $775.00 | $231.15 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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56 | 43 | $123.83 | $83.14 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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52 | 52 | $210.35 | $155.52 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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46 | 42 | $172.26 | $119.59 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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34 | 28 | $71.84 | $52.55 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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30 | 30 | $145.97 | $103.70 |
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43239
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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28 | 28 | $558.00 | $74.47 |
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45380
Biopsy of large bowel using a flexible endoscope
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27 | 27 | $686.00 | $45.86 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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21 | 19 | $227.00 | $161.34 |
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99205
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
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12 | 12 | $256.93 | $204.54 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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11 | 11 | $219.54 | $168.38 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Sucralfate | Sucralfate | 68 | 1,917 | $2,039.65 | 45 |
| Sutab | Sod Sulf/Pot Chloride/Mag Sulf | 48 | 94 | $7,830.41 | 47 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 39 | 292 | $490.66 | 33 |
| Tramadol Hcl | Tramadol Hcl | 28 | 226 | $85.16 | 27 |
| Metoclopramide Hcl | Metoclopramide Hcl | 28 | 840 | $75.90 | 20 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 20 | 191 | $67.56 | 15 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 14 | 113 | $77.62 | 12 |
| Pantoprazole Sodium | Pantoprazole Sodium | 13 | 358 | $75.17 | 11 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2020-10-20NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20080903000248
IN
7012083876
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Marion General Hospital
330 N Wabash Ave, Marion, IN 469522678
Phone: 7656607500
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery
Surgery
Doctor of Osteopathic Medicine (D.O.)
Surgery
Doctor of Osteopathic Medicine (D.O.)
Surgery
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated February 05, 2008.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Surgery Specialists in Marion
- Dr. Edward Keppler, MD
- Dr. Tamy Perng, DO
- Dr. Nitin Sharma, MD
- Dr. Megan Denny, DO
- Dr. Jeffrey Miller, DO
- Stephen Derryberry
Mailing Address
330 N Wabash, Ste 320
Marion, IN 469522600
Phone: 7656607600