Dr. Gregory John Starsiak Jr., DO
- Medicare services, 2024
- 376
- Medicare patients, 2024
- 112
- Part D claims, 2024
- 639
- Hospital affiliations
- 1
- Industry payments
- $171
- Practice address
- 4075 E 128th Ave Tnnh Primary Care, Thornton, CO 80241-2201
- Practice phone
- Call (303) 925-4210
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Tnnh Primary Care
Primary care practice · Thornton, Colorado
Find Dr. Starsiak'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 John Starsiak Jr. is a family medicine physician in Thornton, Colorado
Dr. Starsiak practices at Tnnh Primary Care in Thornton, Colorado.
Dr. Starsiak's NPI, 1578025367, was assigned on April 2, 2019. Dr. Starsiak graduated from Kansas City University of Med & Biosciences, College of Osteo Med in 2019. Dr. Starsiak holds Colorado license DR.0070915.
- NPI
- 1578025367NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092049262
- NPI enumeration date
- April 2, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (303) 925-4210
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory John Starsiak Jr. practices at Tnnh Primary Care in Thornton, Colorado
Dr. Starsiak's primary practice is Tnnh Primary Care, at 4075 E 128th Ave Tnnh Primary Care, Thornton, CO 80241-2201. The practice phone is (303) 925-4210.
- Tnnh Primary Care4075 E 128th Ave Tnnh Primary Care, Thornton, CO 80241-2201Phone(303) 925-4210
Source: Dmand AI Affiliation Data
Dr. Gregory John Starsiak Jr. is affiliated with 2 sites of care and 1 medical group
Dr. Starsiak's primary practice is Tnnh Primary Care in Thornton, Colorado. Dr. Starsiak is also affiliated with CommonSpirit - St. Anthony North Hospital. The medical group on file is Cardiac & Thoracic Surgery Associates (CTSA).
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory John Starsiak Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Starsiak practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Tnnh Primary Care | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory John Starsiak Jr. is one of 2,952 family medicine physicians in Colorado
Family medicine is Dr. Starsiak's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Starsiak is licensed in Colorado.
Specialties and state licenses
- Family medicine, ColoradoPrimary
Family medicine physicians near Dr. Starsiak
Counts of family medicine physicians 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 John Starsiak Jr. billed Medicare for 376 services in 2024
CMS data shows 376 Medicare services from Dr. Starsiak across 6 procedure codes in 2024, for 112 Medicare patients. Medicare paid $13,839 for them.
Dr. Starsiak's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 142024: 1681100%
- Drugs given in the office
- 2023: 02024: 96
- Other services
- 2023: 02024: 65
- Tests and treatments
- 2023: 02024: 47
Where Dr. Starsiak's Medicare services took place, 2024
- In an office35594%
- In a facility216%
Dr. Starsiak compared with the Colorado median for family medicine physicians, 2024
- Dr. Starsiak
- Colorado median
- Medicare services
- 376vs 27238% above
- Medicare patients
- 112vs 12410% below
- Part D claims
- 336vs 68051% below
Medians across 2,975 family medicine physicians in Colorado with Dmand AI profiles that report each measure.
Dr. Starsiak'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. Starsiak and other family medicine physicians in Colorado.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory John Starsiak Jr. treated 112 Medicare patients in 2024, average age 70
CMS counts 112 Medicare patients who saw Dr. Starsiak in 2024. The largest group is 65 to 74, with 57 patients. 60% of them have high blood pressure, and 53% have high cholesterol. 26% are also on Medicaid. Their average risk score is 1.17, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Starsiak's median patient age at 52, with 57% women.
Dr. Starsiak's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Starsiak's Medicare patients by sex, 2024
- Women6962%
- Men4338%
Chronic conditions among Dr. Starsiak's Medicare patients, 2024
- High blood pressure60%
- High cholesterol53%
- Arthritis46%
- Mood disorders33%
- Anxiety27%
- Depression25%
- Diabetes23%
- Osteoporosis21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Starsiak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory John Starsiak Jr. wrote 639 Medicare Part D claims in 2024
In 2024, Dr. Starsiak wrote 639 Medicare Part D claims for 134 patients. 82% of them were for generic drugs. CMS names the drug for 336 of them, across 18 drugs with 11 or more claims each, at $33,774 in total drug cost. In 2023, CMS named 25 claims across 2 drugs.
Dr. Starsiak's Part D claims by kind of drug, 2024
- Generic525 claims82%
- Brand-name and other114 claims18%
Dr. Starsiak'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. Starsiak's Part D claims, 2024
- Opioids2%12 of 639 claims
- Antibiotics6%40 of 639 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: 252024: 3361244%
Drugs named by CMS: 18 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 John Starsiak Jr. takes part in Medicare
Dr. Starsiak accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Removal of skin lesions: 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 John Starsiak Jr. received $171 in industry payments from 2023 to 2025
CMS Open Payments shows 8 general payments to Dr. Starsiak from 6 drug and device companies from 2023 to 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $43.
General payments to Dr. Starsiak by program year, 2023 to 2025
Companies that paid Dr. Starsiak the most, 2023 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory John Starsiak Jr. graduated from Kansas City University of Med & Biosciences, College of Osteo Med
Dr. Starsiak graduated from Kansas City University of Med & Biosciences, College of Osteo Med in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory John Starsiak Jr.'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 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) |
| 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. Gregory John Starsiak Jr.
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 John Starsiak Jr.'s NPI number?
Dr. Gregory John Starsiak Jr.'s NPI number is 1578025367. It was assigned on April 2, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory John Starsiak Jr.?
Dr. Gregory John Starsiak Jr. is a family medicine physician in Thornton, Colorado. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Gregory John Starsiak Jr. practice?
Dr. Starsiak practices at 4075 E 128th Ave Tnnh Primary Care, Thornton, CO 80241-2201. Dr. Starsiak's primary practice is Tnnh Primary Care in Thornton, Colorado.
What is Dr. Gregory John Starsiak Jr.'s office phone number?
The practice phone on file for Dr. Starsiak is (303) 925-4210.
What is Dr. Gregory John Starsiak Jr.'s medical license number?
Dr. Starsiak holds Colorado license DR.0070915.
Which hospitals is Dr. Gregory John Starsiak Jr. affiliated with?
Dr. Starsiak is affiliated with CommonSpirit - St. Anthony North Hospital.
What medical group is Dr. Gregory John Starsiak Jr. part of?
Dr. Starsiak is linked to Cardiac & Thoracic Surgery Associates (CTSA).
Does Dr. Gregory John Starsiak Jr. accept Medicare?
Yes. CMS data shows Dr. Starsiak billed Medicare for 376 services in 2024, and Dr. Starsiak accepts Medicare assignment.
How many Medicare patients does Dr. Gregory John Starsiak Jr. see?
CMS counts 112 Medicare patients who saw Dr. Starsiak in 2024, with an average age of 70.
What services does Dr. Gregory John Starsiak Jr. bill to Medicare?
In 2024, Dr. Starsiak's most billed Medicare services were office visit, established patient (99214), injected or infused drug (J3301) and medicare service (G2211).
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Where did Dr. Gregory John Starsiak Jr. go to medical school?
Dr. Starsiak graduated from Kansas City University of Med & Biosciences, College of Osteo Med in 2019.
What drugs does Dr. Gregory John Starsiak Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Starsiak's most prescribed drugs by claims were Meloxicam, Lisinopril and Atorvastatin Calcium.
Has Dr. Gregory John Starsiak Jr. received payments from drug or device companies?
CMS Open Payments shows $171 in general payments to Dr. Starsiak from 6 companies from 2023 to 2025. The largest total came from Exact Sciences Corporation.
How long has Dr. Gregory John Starsiak Jr. been practicing?
Dr. Starsiak graduated from medical school in 2019, 7 years ago.
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