James A. Underwood
- Medicare services, 2024
- 5,566
- Medicare patients, 2024
- 736
- Part D claims, 2024
- 1,113
- Hospital affiliations
- 4
- Industry payments
- $3,468
- Practice address
- 2510 Lakeland Drive, Flowood, MS 39232
- Practice phone
- Call (601) 354-1234
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
GI Associates & Endoscopy Center
Surgery Center - Medicare-Certified · Flowood, Mississippi
Find James Underwood'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.
James A. Underwood is a gastroenterologist in Flowood, Mississippi
James Underwood practices at GI Associates & Endoscopy Center in Flowood, Mississippi.
James Underwood's NPI, 1447240494, was assigned on October 21, 2005. James Underwood holds Mississippi license 15562.
- NPI
- 1447240494NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5799781357
- NPI enumeration date
- October 21, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (601) 354-1234
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
James A. Underwood practices at GI Associates & Endoscopy Center in Flowood, Mississippi
James Underwood's primary practice is GI Associates & Endoscopy Center, at 2510 Lakeland Drive, Flowood, MS 39232. The practice phone is (601) 354-1234.
- GI Associates & Endoscopy Center2510 Lakeland Drive, Flowood, MS 39232Phone(601) 354-1234
Source: Dmand AI Affiliation Data
James A. Underwood is affiliated with 6 sites of care and 3 medical groups
James Underwood's primary practice is GI Associates & Endoscopy Center in Flowood, Mississippi. James Underwood is also affiliated with Merit Health River Oaks. The medical group on file is St. Dominic Medical Associates. Dmand AI also links James Underwood to 3 more hospitals, 2 medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at James A. Underwood's practice
Dmand AI tracks the electronic health record (EHR) system at each site where James Underwood practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| GI Associates & Endoscopy Center | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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James A. Underwood is one of 104 gastroenterologists in Mississippi
Gastroenterology is James Underwood's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. James Underwood is licensed in Mississippi.
Specialties and state licenses
- Gastroenterology, MississippiPrimary
Gastroenterologists near James Underwood
Counts of gastroenterologists 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
James A. Underwood billed Medicare for 5,566 services in 2024
CMS data shows 5,566 Medicare services from James Underwood across 26 procedure codes in 2024, for 736 Medicare patients. Medicare paid $183,864 for them.
James Underwood's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 02024: 4,200
- Surgery
- 2023: 6482024: 6612%
- Office and hospital visits
- 2023: 2,8932024: 31989%
- Lab and pathology
- 2023: 1382024: 16520%
- Other services
- 2023: 1532024: 1418%
- Tests and treatments
- 2023: 562024: 6618%
- Imaging
- 2023: 132024: 148%
Where James Underwood's Medicare services took place, 2024
- In an office4,77486%
- In a facility79214%
James Underwood compared with the Mississippi median for gastroenterologists, 2024
- James Underwood
- Mississippi median
- Medicare services
- 5,566vs 1,1544.8 times
- Medicare patients
- 736vs 56231% above
- Part D claims
- 992vs 1,004Close to median
Medians across 102 gastroenterologists in Mississippi with Dmand AI profiles that report each measure.
James Underwood'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 James Underwood and other gastroenterologists in Mississippi.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
James A. Underwood treated 736 Medicare patients in 2024, average age 73
CMS counts 736 Medicare patients who saw James Underwood in 2024. The largest group is 65 to 74, with 404 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.07, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts James Underwood's median patient age at 64, with 53% women.
James Underwood's Medicare patients by age, 2024
James Underwood's Medicare patients by sex, 2024
- Women37451%
- Men36249%
Chronic conditions among James Underwood's Medicare patients, 2024
- High blood pressure75%
- High cholesterol73%
- Arthritis52%
- Diabetes35%
- Ischemic heart disease32%
- Anxiety23%
- Mood disorders22%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
James Underwood's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
James A. Underwood wrote 1,113 Medicare Part D claims in 2024
In 2024, James Underwood wrote 1,113 Medicare Part D claims for 553 patients. 82% of them were for generic drugs. CMS names the drug for 992 of them, across 23 drugs with 11 or more claims each, at $69,434 in total drug cost. In 2023, CMS named 923 claims across 24 drugs.
James Underwood's Part D claims by kind of drug, 2024
- Generic914 claims82%
- Brand-name199 claims18%
James Underwood'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 James Underwood's Part D claims, 2024
- Antibiotics9%97 of 1,113 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: 9232024: 9927%
Drugs named by CMS: 23 in 2024, 24 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
James A. Underwood ranks in the 97th percentile for colonoscopy in Medicare
James Underwood accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 270 procedures of colonoscopy by James Underwood, more than 97% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where James Underwood ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 96th percentile330 procedures
- Colonoscopy
- 97th percentile270 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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James A. Underwood received $3,468 in industry payments from 2016 to 2025
CMS Open Payments shows 146 general payments to James Underwood from 25 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $1,138.
General payments to James Underwood by program year, 2016 to 2025
Companies that paid James Underwood 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 James A. Underwood'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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) |
| 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 James A. Underwood
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is James A. Underwood's NPI number?
James A. Underwood's NPI number is 1447240494. It was assigned on October 21, 2005, and it is active in the NPI Registry.
What does James A. Underwood specialize in?
James A. Underwood is a gastroenterologist in Flowood, Mississippi. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does James A. Underwood practice?
James Underwood practices at 2510 Lakeland Drive, Flowood, MS 39232. James Underwood's primary practice is GI Associates & Endoscopy Center in Flowood, Mississippi. Dmand AI also links James Underwood to 3 hospitals, 2 medical groups and 1 group practice or clinic.
What is James A. Underwood's office phone number?
The practice phone on file for James Underwood is (601) 354-1234.
What is James A. Underwood's medical license number?
James Underwood holds Mississippi license 15562.
Which hospitals is James A. Underwood affiliated with?
James Underwood is affiliated with Merit Health River Oaks. Dmand AI links James Underwood to 3 more hospitals.
What medical group is James A. Underwood part of?
James Underwood is linked to St. Dominic Medical Associates. Dmand AI links James Underwood to 2 more medical groups.
Does James A. Underwood accept Medicare?
Yes. CMS data shows James Underwood billed Medicare for 5,566 services in 2024, and James Underwood accepts Medicare assignment.
How many Medicare patients does James A. Underwood see?
CMS counts 736 Medicare patients who saw James Underwood in 2024, with an average age of 73.
What services does James A. Underwood bill to Medicare?
In 2024, James Underwood's most billed Medicare services were injected or infused drug (J3380), surgery: digestive system (45385) and surgery: digestive system (43239).
Show 3 more questionsShow fewer questions
What drugs does James A. Underwood prescribe most?
In 2024 Medicare Part D data, James Underwood's most prescribed drugs by claims were Omeprazole, Gavilyte-C and Peg 3350-Electrolyte.
Has James A. Underwood received payments from drug or device companies?
CMS Open Payments shows $3,468 in general payments to James Underwood from 25 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has James A. Underwood been practicing?
James Underwood graduated from medical school in 1995, 31 years ago.
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