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Dr. Gregory Alan Hamon, MD
NPI1225033194PAC ID9830084482
- Medicare services, 2024
- 75
- Medicare patients, 2024
- 64
- Part D claims, 2024
- 47
- Publications
- 1
- Hospital affiliations
- 3
- Practice address
- 1139 E Sonterra Blvd,, San Antonio, TX 78258
- Practice phone
- Call (210) 638-2101
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hamon'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. Gregory Alan Hamon is a general surgeon in San Antonio, Texas
Dr. Hamon practices at Methodist Hospital Stone Oak in San Antonio, Texas, part of HCA Healthcare.
Dr. Hamon's NPI, 1225033194, was assigned on June 16, 2005. Dr. Hamon graduated from UT Southwestern Medical Center in 1989. Dr. Hamon's Texas license number on file is H8107.
NPI and contact details
- NPI
- 1225033194NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9830084482
- NPI enumeration date
- June 16, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (210) 638-2101
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Alan Hamon practices at Methodist Hospital Stone Oak in San Antonio, Texas
Dr. Hamon's primary practice is Methodist Hospital Stone Oak, at 1139 E Sonterra Blvd,, San Antonio, TX 78258 in Bexar County. The practice phone is (210) 638-2101.
- Methodist Hospital Stone Oak1139 E Sonterra Blvd,, San Antonio, TX 78258 · Bexar CountyPhone(210) 638-2101
Source: Dmand AI Affiliation Data
Dr. Gregory Alan Hamon is affiliated with 4 sites of care and 1 medical group
Dr. Hamon's primary practice is Methodist Hospital Stone Oak in San Antonio, Texas, part of HCA Healthcare. Dr. Hamon is also affiliated with Methodist Hospital. The medical group on file is Surgical Oncology Associates of South Texas. Dmand AI also links Dr. Hamon to 1 more hospital and 1 physician office, each named with a free account.
Methodist HospitalSurgical Oncology Associates of South Texas1 hospitalName with a free account1 physician officeName with a free account
See all 5 affiliations for Dr. HamonSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory Alan Hamon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hamon practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Methodist Hospital Stone Oak | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory Alan Hamon is one of 1,939 general surgeons in Texas
Surgery is Dr. Hamon's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Hamon is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Hamon's licenses on file in 3 states: Texas, California and South Carolina.
Specialties and state licenses
- Surgery, TexasPrimary
- Vascular surgery, California
- South Carolina license
Clinical focus
Dmand AI lists abdominal adhesion surgery, abdominal hernia repair surgery, appendectomy, colon removal, esophagus, stomach, or upper small intestine surgery, gallbladder removal, groin hernia surgery and removal of damaged skin or skin graft among the conditions Dr. Hamon treats.
General surgeons near Dr. Hamon
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
1,939general surgeons in Texas130general surgeons in San Antonio4general surgeons at Methodist Hospital Stone Oak
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory Alan Hamon billed Medicare for 75 services in 2024
CMS data shows 75 Medicare services from Dr. Hamon across 3 procedure codes in 2024, for 64 Medicare patients. Medicare paid $14,616 for them.
Medicare services, 202475
Medicare patients64
Paid by Medicare$14,616
Procedure codes3
Dr. Hamon's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1802024: 5768%
- Surgery
- 2023: 172024: 186%
Where Dr. Hamon's Medicare services took place, 2024
- In an office1216%
- In a facility6384%
Dr. Hamon compared with the Texas median for general surgeons, 2024
- Dr. Hamon
- Texas median
- Medicare services
- 75vs 11836% below
- Medicare patients
- 64vs 9734% below
- Part D claims
- 16vs 4262% below
Medians across 1,674 general surgeons in Texas with Dmand AI profiles that report each measure.
Dr. Hamon'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. Hamon?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hamon and other general surgeons in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Alan Hamon treated 64 Medicare patients in 2024, average age 76
CMS counts 64 Medicare patients who saw Dr. Hamon in 2024. The largest group is 75 to 84, with 28 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 2.21, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Hamon's median patient age at 61, with 54% women.
Medicare patients, 202464
Average age76
Average risk score2.21
Dr. Hamon's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Hamon's Medicare patients by sex, 2024
- Women2742%
- Men3758%
Chronic conditions among Dr. Hamon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Ischemic heart disease53%
- Chronic kidney disease52%
- Diabetes47%
- Atrial fibrillation33%
- Cancer33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hamon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women54%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Alan Hamon wrote 47 Medicare Part D claims in 2024
In 2024, Dr. Hamon wrote 47 Medicare Part D claims for 21 patients. 85% of them were for generic drugs. CMS names the drug for 16 of them, across 1 drug with 11 or more claims each, at $158 in total drug cost. In 2023, CMS named 28 claims across 2 drugs.
Part D claims, 202447
Drugs named by CMS1
Total drug cost$158
Part D patients21
Dr. Hamon's Part D claims by kind of drug, 2024
- Generic40 claims85%
- Brand-name and other7 claims15%
Dr. Hamon'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. Hamon's Part D claims, 2024
- Opioids36%17 of 47 claims
- Antibiotics34%16 of 47 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: 282024: 1643%
Drugs named by CMS: 1 in 2024, 2 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
How Dr. Gregory Alan Hamon takes part in Medicare
Dr. Hamon accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Mastectomy: 1 to 10 procedures (CMS shows small counts as a range)
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)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gregory Alan Hamon has 1 publication on record
Dmand AI links 1 paper to Dr. Hamon. Dr. Hamon's most frequent co-author is Zane K. Wade, MD.
Papers1
Dr. Hamon's most frequent co-authors
Recent publications by Dr. Hamon
See who Dr. Hamon researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hamon works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory Alan Hamon received $30,072 in industry payments from 2016 to 2025
CMS Open Payments shows 78 general payments to Dr. Hamon from 15 drug and device companies from 2016 to 2025. Education make up the largest share, 80% of the total. Intuitive Surgical, Inc. paid the most, $27,505.
General payments to Dr. Hamon by program year, 2016 to 2025
General payments to Dr. Hamon by kind, 2016 to 2025
$30.1Kin total
- Education$24,00080%
- Food and beverage$5,12717%
- Travel and lodging$9453%
Companies that paid Dr. Hamon 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. Gregory Alan Hamon has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Hamon, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Hamon
- 2013
- CMS Stage 1 EHR
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Gregory Alan Hamon graduated from UT Southwestern Medical Center
Dr. Hamon graduated from UT Southwestern Medical Center in 1989. Dr. Hamon is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Gregory Alan Hamon accepts plans from 23 insurance carriers
Dr. Hamon is in network with 23 carriers, including United Healthcare, Aetna and Cigna. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
- United Healthcare
- Aetna
- Cigna
- Elevance
- HCSC
- Humana
- Alliant Health Plans
- Aspirus Health Plan
- +15 more carriersWith a free account
Plan types Dr. Hamon accepts, by number of carriers
- PPO14
- HMO13
- Medicare8
- EPO4
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory Alan Hamon'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Gregory Alan Hamon
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. Gregory Alan Hamon's NPI number?
Dr. Gregory Alan Hamon's NPI number is 1225033194. It was assigned on June 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Alan Hamon?
Dr. Gregory Alan Hamon is a general surgeon in San Antonio, Texas. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gregory Alan Hamon practice?
Dr. Hamon practices at 1139 E Sonterra Blvd,, San Antonio, TX 78258. Dr. Hamon's primary practice is Methodist Hospital Stone Oak in San Antonio, Texas, part of HCA Healthcare. Dmand AI also links Dr. Hamon to 1 hospital and 1 physician office.
What is Dr. Gregory Alan Hamon's office phone number?
The practice phone on file for Dr. Hamon is (210) 638-2101.
What is Dr. Gregory Alan Hamon's medical license number?
Dr. Hamon's Texas license number on file is H8107, one of the licenses on file in 3 states.
Which states has Dr. Gregory Alan Hamon been licensed in?
Dmand AI has state licenses on file for Dr. Hamon in Texas (1990 to 2025), California (since 1991) and South Carolina (1999 to 2001).
Which hospitals is Dr. Gregory Alan Hamon affiliated with?
Dr. Hamon practices at Methodist Hospital Stone Oak in San Antonio, Texas. Dr. Hamon is also affiliated with Methodist Hospital. Dmand AI links Dr. Hamon to 1 more hospital.
What medical group is Dr. Gregory Alan Hamon part of?
Dr. Hamon is linked to Surgical Oncology Associates of South Texas.
Does Dr. Gregory Alan Hamon accept Medicare?
Yes. CMS data shows Dr. Hamon billed Medicare for 75 services in 2024, and Dr. Hamon accepts Medicare assignment.
How many Medicare patients does Dr. Gregory Alan Hamon see?
CMS counts 64 Medicare patients who saw Dr. Hamon in 2024, with an average age of 76.
Show 9 more questionsShow fewer questions
Is Dr. Gregory Alan Hamon board certified?
Yes. Dr. Hamon is board certified in surgery by the American Board of Surgery.
What services does Dr. Gregory Alan Hamon bill to Medicare?
In 2024, Dr. Hamon's most billed Medicare services were hospital inpatient care (99222), surgery: digestive system (47562) and office visit, established patient (99214).
Where did Dr. Gregory Alan Hamon go to medical school?
Dr. Hamon graduated from UT Southwestern Medical Center in 1989.
What drugs does Dr. Gregory Alan Hamon prescribe most?
In 2024 Medicare Part D data, Dr. Hamon's most prescribed drugs by claims were Acetaminophen-Codeine.
Has Dr. Gregory Alan Hamon received payments from drug or device companies?
CMS Open Payments shows $30,072 in general payments to Dr. Hamon from 15 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Gregory Alan Hamon been practicing?
Dr. Hamon graduated from medical school in 1989, 37 years ago.
Does Dr. Gregory Alan Hamon do research?
Dmand AI links 1 publication to Dr. Hamon.
Who does Dr. Gregory Alan Hamon publish with?
Dr. Hamon's most frequent co-authors are Zane K. Wade, MD (1 shared paper).
What insurance does Dr. Gregory Alan Hamon accept?
Dr. Hamon is in network with 23 carriers, including United Healthcare, Aetna and Cigna. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
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