Dr. Gregory D. Andreassian, MD, PA
- Medicare services, 2023
- 347
- Medicare patients, 2024
- 11
- Part D claims, 2023
- 101
- Industry payments
- $7,143
- Medical group
- 1
- Practice address
- 1020 S State Highway 16, Fredericksburg, TX 78624
- Practice phone
- Call (830) 997-6773
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Medical group
Find Dr. Andreassian'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 D. Andreassian is a general surgeon in Fredericksburg, Texas
Dr. Andreassian practices with Chinle Comprehensive Health Care Facility, a medical group.
Dr. Andreassian's NPI, 1619973120, was assigned on June 21, 2005. Dr. Andreassian graduated from Joe R. & Teresa Lozano Long School of Medicine in 1985. Dr. Andreassian holds Texas license H0136.
- NPI
- 1619973120NPI Registry (opens in a new tab)
- NPI enumeration date
- June 21, 2005
- NPI status
- Active
- Practice phone
- (830) 997-6773
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Gregory D. Andreassian's practice address is in Fredericksburg, Texas
Dr. Andreassian's practice address in the NPI Registry is 1020 S State Highway 16, Fredericksburg, TX 78624, in Gillespie County. The practice phone is (830) 997-6773.
- NPI Registry address1020 S State Highway 16, Fredericksburg, TX 78624 · Gillespie CountyPhone(830) 997-6773
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory D. Andreassian is affiliated with 1 medical group
Dr. Andreassian is part of Chinle Comprehensive Health Care Facility, a medical group in Chinle, Arizona.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory D. Andreassian's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Andreassian practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Chinle Comprehensive Health Care Facility | 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 Chinle Comprehensive Health Care Facility and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Gregory D. Andreassian is one of 1,939 general surgeons in Texas
Surgery is Dr. Andreassian's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Andreassian is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Andreassian's licenses on file in 5 states: Texas, Montana, Oklahoma, Wyoming and Alaska.
Specialties and state licenses
- Surgery, TexasPrimary
- Montana license
- Oklahoma license
- Wyoming license
- Alaska license
Clinical focus
Dmand AI lists abdominal hernia repair surgery, breast reconstruction, cancerous skin growth removal, colonoscopy, colon removal, gallbladder removal, gastrointestinal bleeding and groin hernia surgery among the conditions Dr. Andreassian treats.
General surgeons near Dr. Andreassian
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. Gregory D. Andreassian billed Medicare for 347 services in 2023
CMS data shows 347 Medicare services from Dr. Andreassian across 10 procedure codes in 2023, for 11 Medicare patients. Medicare paid $38,580 for them.
Dr. Andreassian's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Surgery
- 2022: 2412023: 15337%
- Office and hospital visits
- 2022: 1922023: 14723%
- Other services
- 2022: 612023: 4723%
Where Dr. Andreassian's Medicare services took place, 2023
- In an office14742%
- In a facility20058%
Dr. Andreassian compared with the Texas median for general surgeons, 2023
- Dr. Andreassian
- Texas median
- Medicare services
- 347vs 1182.9 times
- Medicare patients
- 11vs 9789% below
- Part D claims
- 101vs 422.4 times
Medians across 1,674 general surgeons in Texas with Dmand AI profiles that report each measure.
Dr. Andreassian's most billed Medicare procedure codes, 2023
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. Andreassian?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Andreassian 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 D. Andreassian treated 11 Medicare patients in 2024, average age 67
CMS counts 11 Medicare patients who saw Dr. Andreassian in 2024. The largest group is 85 and over, with 0 patients. Their average risk score is 1.16, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Andreassian's median patient age at 57, with 50% women.
Dr. Andreassian's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Andreassian's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory D. Andreassian wrote 101 Medicare Part D claims in 2023
In 2023, Dr. Andreassian wrote 101 Medicare Part D claims. They cover 4 drugs, with $7,240 in total drug cost. In 2022, CMS named 122 claims across 2 drugs.
Dr. Andreassian's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 1222023: 10117%
Drugs named by CMS: 4 in 2023, 2 in 2022.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gregory D. Andreassian received $7,143 in industry payments from 2016 to 2025
CMS Open Payments shows 44 general payments to Dr. Andreassian from 12 drug and device companies from 2016 to 2025. Education make up the largest share, 56% of the total. Intuitive Surgical, Inc. paid the most, $5,456.
General payments to Dr. Andreassian by program year, 2016 to 2025
General payments to Dr. Andreassian by kind, 2016 to 2025
- Education$4,00056%
- Travel and lodging$1,87926%
- Food and beverage$1,26418%
Companies that paid Dr. Andreassian 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 D. Andreassian has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Andreassian, most recently ACS Fellow in 2013.
Awards and honors for Dr. Andreassian
- 2013
- ACS Fellow
- Undated
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Gregory D. Andreassian graduated from Joe R. & Teresa Lozano Long School of Medicine
Dr. Andreassian graduated from Joe R. & Teresa Lozano Long School of Medicine in 1985. Dr. Andreassian is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Gregory D. Andreassian accepts plans from 13 insurance carriers
Dr. Andreassian is in network with 13 carriers, including United Healthcare, Aetna and Alliant Health Plans. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- United Healthcare
- Aetna
- Alliant Health Plans
- Elevance
- HCSC
- Baylor Scott and White
- Blue Cross and Blue Shield of Kansas City
- Blue Cross Blue Shield of Michigan
- +5 more carriersWith a free account
Plan types Dr. Andreassian accepts, by number of carriers
- HMO8
- PPO7
- POS3
- EPO2
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory D. Andreassian'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 | Dmand 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) |
| 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 D. Andreassian
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 D. Andreassian's NPI number?
Dr. Gregory D. Andreassian's NPI number is 1619973120. It was assigned on June 21, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory D. Andreassian?
Dr. Gregory D. Andreassian is a general surgeon in Fredericksburg, Texas. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gregory D. Andreassian practice?
Dr. Andreassian practices at 1020 S State Highway 16, Fredericksburg, TX 78624. Dr. Andreassian's primary practice is Chinle Comprehensive Health Care Facility, a medical group.
What is Dr. Gregory D. Andreassian's office phone number?
The practice phone on file for Dr. Andreassian is (830) 997-6773.
What is Dr. Gregory D. Andreassian's medical license number?
Dr. Andreassian holds Texas license H0136, one of the licenses on file in 5 states.
Which states has Dr. Gregory D. Andreassian been licensed in?
Dmand AI has state licenses on file for Dr. Andreassian in Texas (1986 to 2026), Montana (2018 to 2026), Oklahoma (2018 to 2025), Wyoming (2018 to 2025) and Alaska (2018 to 2024).
What medical group is Dr. Gregory D. Andreassian part of?
Dr. Andreassian is part of Chinle Comprehensive Health Care Facility in Chinle, Arizona.
Does Dr. Gregory D. Andreassian accept Medicare?
Yes. CMS data shows Dr. Andreassian billed Medicare for 347 services in 2023.
How many Medicare patients does Dr. Gregory D. Andreassian see?
CMS counts 11 Medicare patients who saw Dr. Andreassian in 2024, with an average age of 67.
Is Dr. Gregory D. Andreassian board certified?
Yes. Dr. Andreassian is board certified in surgery by the American Board of Surgery.
Show 6 more questionsShow fewer questions
What services does Dr. Gregory D. Andreassian bill to Medicare?
In 2023, Dr. Andreassian's most billed Medicare services were surgery: digestive system (45380), office visit, established patient (99213) and office visit, new patient (99203).
Where did Dr. Gregory D. Andreassian go to medical school?
Dr. Andreassian graduated from Joe R. & Teresa Lozano Long School of Medicine in 1985.
What drugs does Dr. Gregory D. Andreassian prescribe most?
In 2023 Medicare Part D data, Dr. Andreassian's most prescribed drugs by claims were Sutab, Hydrocodone-Acetaminophen and Metoclopramide HCl.
Has Dr. Gregory D. Andreassian received payments from drug or device companies?
CMS Open Payments shows $7,143 in general payments to Dr. Andreassian from 12 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Gregory D. Andreassian been practicing?
Dr. Andreassian graduated from medical school in 1985, 41 years ago.
What insurance does Dr. Gregory D. Andreassian accept?
Dr. Andreassian is in network with 13 carriers, including United Healthcare, Aetna and Alliant Health Plans. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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