Dr. William Colin Gallahan, MD
- Medicare services, 2024
- 1,318
- Medicare patients, 2024
- 869
- Part D claims, 2024
- 1,403
- MIPS score, 2024
- 75
- Hospital affiliations
- 6
- Practice address
- 223 Wadsworth Dr, North Chesterfield, VA 23236
- Practice phone
- Call (804) 330-4901
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Richmond Gastroenterology Associates, Inc.
North Chesterfield, Virginia
Find Dr. Gallahan's professional email, personal email and mobile number
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Dr. William Colin Gallahan is an internist in North Chesterfield, Virginia
Dr. Gallahan practices at Richmond Gastroenterology Associates, Inc. in North Chesterfield, Virginia.
Dr. Gallahan's NPI, 1508040213, was assigned on December 18, 2007. Dr. Gallahan graduated from University of Virginia School of Medicine in 2004. Dr. Gallahan holds North Carolina license 2010-00678.
- NPI
- 1508040213NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9133250004
- NPI enumeration date
- December 18, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (804) 330-4901
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Colin Gallahan practices at Richmond Gastroenterology Associates, Inc. in North Chesterfield, Virginia
Dr. Gallahan's primary practice is Richmond Gastroenterology Associates, Inc., at 223 Wadsworth Dr, North Chesterfield, VA 23236 in Chesterfield County. The practice phone is (804) 330-4901.
- Richmond Gastroenterology Associates, Inc.223 Wadsworth Dr, North Chesterfield, VA 23236 · Chesterfield CountyPhone(804) 330-4901
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. William Colin Gallahan is affiliated with 8 sites of care and 1 medical group
Dr. Gallahan's primary practice is Richmond Gastroenterology Associates, Inc. in North Chesterfield, Virginia. Dr. Gallahan is also affiliated with Bon Secours St. Mary's Hospital. The medical group on file is Richmond Gastroenterology Associates. Dmand AI also links Dr. Gallahan to 5 more hospitals and 1 group practice or clinic, each 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. William Colin Gallahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gallahan practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Richmond Gastroenterology Associates, Inc. | Available with a free account |
| +7 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Colin Gallahan is one of 3,339 internists in Virginia
Internal medicine is Dr. Gallahan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gallahan is licensed in North Carolina.
Specialties and state licenses
- Internal medicine, North CarolinaPrimary
Internists near Dr. Gallahan
Counts of internists 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. William Colin Gallahan billed Medicare for 1,318 services in 2024
CMS data shows 1,318 Medicare services from Dr. Gallahan across 16 procedure codes in 2024, for 869 Medicare patients. Medicare paid $151,619 for them.
Dr. Gallahan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6652024: 6295%
- Surgery
- 2023: 6572024: 6107%
- Other services
- 2023: 522024: 504%
- Imaging
- 2023: 172024: 2971%
Where Dr. Gallahan's Medicare services took place, 2024
- In an office46435%
- In a facility85465%
Dr. Gallahan compared with the Virginia median for internists, 2024
- Dr. Gallahan
- Virginia median
- Medicare services
- 1,318vs 6072.2 times
- Medicare patients
- 869vs 2463.5 times
- Part D claims
- 1,236vs 2245.5 times
Medians across 3,182 internists in Virginia with Dmand AI profiles that report each measure.
Dr. Gallahan'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. Gallahan and other internists in Virginia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Colin Gallahan treated 869 Medicare patients in 2024, average age 75
CMS counts 869 Medicare patients who saw Dr. Gallahan in 2024. The largest group is 65 to 74, with 392 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.33, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gallahan's median patient age at 65, with 58% women.
Dr. Gallahan's Medicare patients by age, 2024
Dr. Gallahan's Medicare patients by sex, 2024
- Women49857%
- Men37143%
Chronic conditions among Dr. Gallahan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Diabetes34%
- Ischemic heart disease29%
- Anxiety24%
- Cancer23%
- Chronic kidney disease23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gallahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women58%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Colin Gallahan wrote 1,403 Medicare Part D claims in 2024
In 2024, Dr. Gallahan wrote 1,403 Medicare Part D claims for 643 patients. 72% of them were for generic drugs. CMS names the drug for 1,236 of them, across 22 drugs with 11 or more claims each, at $364,706 in total drug cost. In 2023, CMS named 799 claims across 21 drugs.
Dr. Gallahan's Part D claims by kind of drug, 2024
- Generic1,013 claims72%
- Brand-name390 claims28%
Dr. Gallahan'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 7992024: 1,23655%
Drugs named by CMS: 22 in 2024, 21 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. William Colin Gallahan scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Gallahan for performance year 2024, reported as part of a group. Dr. Gallahan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gallahan as offering telehealth. CMS counts 182 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Gallahan, more than 89% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- MIPS final score, 2024
- 75 of 100
Where Dr. Gallahan ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 89th percentile182 procedures
- Colonoscopy
- 83rd percentile114 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
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)
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Dr. William Colin Gallahan received $11,347 in industry payments from 2016 to 2025
CMS Open Payments shows 662 general payments to Dr. Gallahan from 43 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, $4,352.
General payments to Dr. Gallahan by program year, 2016 to 2025
Companies that paid Dr. Gallahan 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. William Colin Gallahan graduated from University of Virginia School of Medicine
Dr. Gallahan graduated from University of Virginia School of Medicine in 2004.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Colin Gallahan'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. William Colin Gallahan
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. William Colin Gallahan's NPI number?
Dr. William Colin Gallahan's NPI number is 1508040213. It was assigned on December 18, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. William Colin Gallahan?
Dr. William Colin Gallahan is an internist in North Chesterfield, Virginia. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William Colin Gallahan practice?
Dr. Gallahan practices at 223 Wadsworth Dr, North Chesterfield, VA 23236. Dr. Gallahan's primary practice is Richmond Gastroenterology Associates, Inc. in North Chesterfield, Virginia. Dmand AI also links Dr. Gallahan to 5 hospitals and 1 group practice or clinic.
What is Dr. William Colin Gallahan's office phone number?
The practice phone on file for Dr. Gallahan is (804) 330-4901.
What is Dr. William Colin Gallahan's medical license number?
Dr. Gallahan holds North Carolina license 2010-00678.
Which hospitals is Dr. William Colin Gallahan affiliated with?
Dr. Gallahan is affiliated with Bon Secours St. Mary's Hospital. Dmand AI links Dr. Gallahan to 5 more hospitals.
What medical group is Dr. William Colin Gallahan part of?
Dr. Gallahan is linked to Richmond Gastroenterology Associates.
Does Dr. William Colin Gallahan accept Medicare?
Yes. CMS data shows Dr. Gallahan billed Medicare for 1,318 services in 2024, and Dr. Gallahan accepts Medicare assignment.
Does Dr. William Colin Gallahan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Gallahan as offering telehealth services.
What is Dr. William Colin Gallahan's MIPS score?
Dr. Gallahan's MIPS final score for performance year 2024 is 75 out of 100, reported as part of a group.
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How many Medicare patients does Dr. William Colin Gallahan see?
CMS counts 869 Medicare patients who saw Dr. Gallahan in 2024, with an average age of 75.
What services does Dr. William Colin Gallahan bill to Medicare?
In 2024, Dr. Gallahan's most billed Medicare services were surgery: digestive system (45385), office visit, established patient (99214) and surgery: digestive system (43239).
Where did Dr. William Colin Gallahan go to medical school?
Dr. Gallahan graduated from University of Virginia School of Medicine in 2004.
What drugs does Dr. William Colin Gallahan prescribe most?
In 2024 Medicare Part D data, Dr. Gallahan's most prescribed drugs by claims were Pantoprazole Sodium, Gavilyte-G and Peg-3350 And Electrolytes.
Has Dr. William Colin Gallahan received payments from drug or device companies?
CMS Open Payments shows $11,347 in general payments to Dr. Gallahan from 43 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. William Colin Gallahan been practicing?
Dr. Gallahan graduated from medical school in 2004, 22 years ago.
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