Dr. Gregory R. Martens, MD
- Medicare services, 2024
- 60
- Medicare patients, 2024
- 49
- Part D claims, 2023
- 24
- MIPS score, 2024
- 84
- Hospital affiliations
- 1
- Practice address
- One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110
- Practice phone
- Call (314) 747-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Martens' professional email, personal email and mobile number
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Dr. Gregory R. Martens is a general surgeon in Saint Louis, Missouri
Dr. Martens practices at Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.
Dr. Martens' NPI, 1316201940, was assigned on June 28, 2012. Dr. Martens graduated from Indiana University School of Medicine in 2012. Dr. Martens holds Missouri license 2021016714.
- NPI
- 1316201940NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092952655
- NPI enumeration date
- June 28, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 747-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory R. Martens practices at 2 locations in Saint Louis, Missouri
Dr. Martens' primary practice is Barnes-Jewish Hospital, at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 in St. Louis City. The practice phone is (314) 747-3000. Dr. Martens also practices at Barnes-Jewish Hospital, 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110.
- Barnes-Jewish HospitalPrimaryOne Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 · St. Louis CityPhone(314) 747-3000
- Barnes-Jewish Hospital1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110 · Saint Louis CityPhone(314) 747-3000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Gregory R. Martens is affiliated with 2 sites of care and 1 medical group
Dr. Martens' primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Martens to 1 more home health agency, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory R. Martens' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Martens practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Barnes-Jewish Hospital | 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 R. Martens is one of 593 general surgeons in Missouri
Surgery is Dr. Martens' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Martens is licensed in Missouri.
Specialties and state licenses
- Surgery, MissouriPrimary
General surgeons near Dr. Martens
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 R. Martens billed Medicare for 60 services in 2024
CMS data shows 60 Medicare services from Dr. Martens across 3 procedure codes in 2024, for 49 Medicare patients. Medicare paid $28,434 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Martens' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 192024: 3268%
- Surgery
- 2023: 292024: 283%
Dr. Martens compared with the Missouri median for general surgeons, 2024
- Dr. Martens
- Missouri median
- Medicare services
- 60vs 16964% below
- Medicare patients
- 49vs 12761% below
- Part D claims
- 24vs 4141% below
Medians across 570 general surgeons in Missouri with Dmand AI profiles that report each measure.
Dr. Martens' 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. Martens and other general surgeons in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory R. Martens treated 49 Medicare patients in 2024, average age 60
CMS counts 49 Medicare patients who saw Dr. Martens in 2024. The largest group is under 65, with 23 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 24% are also on Medicaid. Their average risk score is 9.27, 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. Martens' median patient age at 66, with 50% women.
Dr. Martens' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Martens' Medicare patients by sex, 2024
- Women1837%
- Men3163%
Chronic conditions among Dr. Martens' Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes63%
- Ischemic heart disease47%
- Arthritis35%
- Heart failure35%
- Atrial fibrillation33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Martens' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
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 R. Martens wrote 24 Medicare Part D claims in 2023
In 2023, Dr. Martens wrote 24 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $101 in total drug cost. In 2022, CMS named 67 claims across 4 drugs.
Dr. Martens' 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: 672023: 2464%
Drugs named by CMS: 1 in 2023, 4 in 2022.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
Dr. Gregory R. Martens scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Dr. Martens for performance year 2024, reported as part of a group. Dr. Martens accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Martens' MIPS scores, performance year 2024
- 84of 100Final score
- 71.6of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gregory R. Martens received $1,648 in industry payments from 2021 to 2025
CMS Open Payments shows 20 general payments to Dr. Martens from 9 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 100% of the total. Baxter Healthcare paid the most, $486.
General payments to Dr. Martens by program year, 2021 to 2025
Companies that paid Dr. Martens the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory R. Martens graduated from Indiana University School of Medicine
Dr. Martens graduated from Indiana University School of Medicine in 2012.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory R. Martens'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 Affiliation DataDmand AI Practice 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) |
| 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) |
| 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 R. Martens
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 R. Martens' NPI number?
Dr. Gregory R. Martens' NPI number is 1316201940. It was assigned on June 28, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory R. Martens?
Dr. Gregory R. Martens is a general surgeon in Saint Louis, Missouri. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gregory R. Martens practice?
Dr. Martens practices at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110. Dr. Martens also practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110. Dr. Martens' primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dmand AI also links Dr. Martens to 1 home health agency.
What is Dr. Gregory R. Martens' office phone number?
The practice phone on file for Dr. Martens is (314) 747-3000.
What is Dr. Gregory R. Martens' medical license number?
Dr. Martens holds Missouri license 2021016714.
Which hospitals is Dr. Gregory R. Martens affiliated with?
Dr. Martens practices at Barnes-Jewish Hospital in Saint Louis, Missouri.
What medical group is Dr. Gregory R. Martens part of?
Dr. Martens is linked to WashU Medicine Psychiatry.
Does Dr. Gregory R. Martens accept Medicare?
Yes. CMS data shows Dr. Martens billed Medicare for 60 services in 2024, and Dr. Martens accepts Medicare assignment.
What is Dr. Gregory R. Martens' MIPS score?
Dr. Martens' MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
How many Medicare patients does Dr. Gregory R. Martens see?
CMS counts 49 Medicare patients who saw Dr. Martens in 2024, with an average age of 60.
Show 5 more questionsShow fewer questions
What services does Dr. Gregory R. Martens bill to Medicare?
In 2024, Dr. Martens' most billed Medicare services were hospital inpatient care (99232), surgery: urinary system (50323) and surgery: urinary system (50360).
Where did Dr. Gregory R. Martens go to medical school?
Dr. Martens graduated from Indiana University School of Medicine in 2012.
What drugs does Dr. Gregory R. Martens prescribe most?
In 2023 Medicare Part D data, Dr. Martens' most prescribed drugs by claims were Oxycodone HCl.
Has Dr. Gregory R. Martens received payments from drug or device companies?
CMS Open Payments shows $1,648 in general payments to Dr. Martens from 9 companies from 2021 to 2025. The largest total came from Baxter Healthcare.
How long has Dr. Gregory R. Martens been practicing?
Dr. Martens graduated from medical school in 2012, 14 years ago.
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