Dr. Grace Martin Niziolek, MD
- Medicare services, 2024
- 283
- Medicare patients, 2024
- 198
- MIPS score, 2024
- 84
- Hospital affiliations
- 4
- Industry payments
- $901
- 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. Niziolek'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. Grace Martin Niziolek is a general surgeon in Saint Louis, Missouri
Dr. Niziolek practices at Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.
Dr. Niziolek's NPI, 1528486339, was assigned on March 31, 2014. Dr. Niziolek holds Missouri license 2023027659.
- NPI
- 1528486339NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6406073600
- NPI enumeration date
- March 31, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (314) 747-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Grace Martin Niziolek practices at 2 locations in Saint Louis, Missouri
Dr. Niziolek's 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. Niziolek 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. Grace Martin Niziolek is affiliated with 4 sites of care and 1 medical group
Dr. Niziolek's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dr. Niziolek is also affiliated with Memorial Hospital in Belleville. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Niziolek to 2 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Grace Martin Niziolek's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Niziolek practices, 4 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 |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Grace Martin Niziolek is one of 593 general surgeons in Missouri
Surgery is Dr. Niziolek's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Niziolek is licensed in Missouri.
Specialties and state licenses
- Surgery, MissouriPrimary
General surgeons near Dr. Niziolek
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. Grace Martin Niziolek billed Medicare for 283 services in 2024
CMS data shows 283 Medicare services from Dr. Niziolek across 4 procedure codes in 2024, for 198 Medicare patients. Medicare paid $18,700 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Niziolek's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1912024: 28348%
Dr. Niziolek compared with the Missouri median for general surgeons, 2024
- Dr. Niziolek
- Missouri median
- Medicare services
- 283vs 16967% above
- Medicare patients
- 198vs 12756% above
Medians across 570 general surgeons in Missouri with Dmand AI profiles that report each measure.
Dr. Niziolek'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. Niziolek and other general surgeons in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Grace Martin Niziolek treated 198 Medicare patients in 2024, average age 74
CMS counts 198 Medicare patients who saw Dr. Niziolek in 2024. The largest group is 65 to 74, with 63 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 27% are also on Medicaid. Their average risk score is 2.57, 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. Niziolek's median patient age at 74, with 47% women.
Dr. Niziolek's Medicare patients by age, 2024
Dr. Niziolek's Medicare patients by sex, 2024
- Women9447%
- Men10453%
Chronic conditions among Dr. Niziolek's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis65%
- Chronic kidney disease53%
- Anxiety48%
- Diabetes46%
- Heart failure46%
- Mood disorders44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Niziolek's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Grace Martin Niziolek 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. Niziolek for performance year 2024, reported as part of a group. Dr. Niziolek accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Niziolek as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Niziolek's 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.
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 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); 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. Grace Martin Niziolek received $901 in industry payments from 2024 to 2025
CMS Open Payments shows 8 general payments to Dr. Niziolek from 3 drug and device companies from 2024 to 2025. Travel and lodging make up the largest share, 83% of the total. Zimmer Biomet Holdings, Inc. paid the most, $854.
General payments to Dr. Niziolek by program year, 2024 to 2025
General payments to Dr. Niziolek by kind, 2024 to 2025
- Travel and lodging$75283%
- Food and beverage$14917%
Companies that paid Dr. Niziolek the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Grace Martin Niziolek'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) |
| 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) |
| 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. Grace Martin Niziolek
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. Grace Martin Niziolek's NPI number?
Dr. Grace Martin Niziolek's NPI number is 1528486339. It was assigned on March 31, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Grace Martin Niziolek?
Dr. Grace Martin Niziolek is a general surgeon in Saint Louis, Missouri. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Grace Martin Niziolek practice?
Dr. Niziolek practices at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110. Dr. Niziolek also practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110. Dr. Niziolek's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dmand AI also links Dr. Niziolek to 2 hospitals.
What is Dr. Grace Martin Niziolek's office phone number?
The practice phone on file for Dr. Niziolek is (314) 747-3000.
What is Dr. Grace Martin Niziolek's medical license number?
Dr. Niziolek holds Missouri license 2023027659.
Which hospitals is Dr. Grace Martin Niziolek affiliated with?
Dr. Niziolek practices at Barnes-Jewish Hospital in Saint Louis, Missouri. Dr. Niziolek is also affiliated with Memorial Hospital in Belleville. Dmand AI links Dr. Niziolek to 2 more hospitals.
What medical group is Dr. Grace Martin Niziolek part of?
Dr. Niziolek is linked to WashU Medicine Psychiatry.
Does Dr. Grace Martin Niziolek accept Medicare?
Yes. CMS data shows Dr. Niziolek billed Medicare for 283 services in 2024, and Dr. Niziolek accepts Medicare assignment.
Does Dr. Grace Martin Niziolek offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Niziolek as offering telehealth services.
What is Dr. Grace Martin Niziolek's MIPS score?
Dr. Niziolek's MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Grace Martin Niziolek see?
CMS counts 198 Medicare patients who saw Dr. Niziolek in 2024, with an average age of 74.
What services does Dr. Grace Martin Niziolek bill to Medicare?
In 2024, Dr. Niziolek's most billed Medicare services were hospital inpatient care (99231), hospital inpatient care (99222) and critical care (99291).
Has Dr. Grace Martin Niziolek received payments from drug or device companies?
CMS Open Payments shows $901 in general payments to Dr. Niziolek from 3 companies from 2024 to 2025. The largest total came from Zimmer Biomet Holdings, Inc.
How long has Dr. Grace Martin Niziolek been practicing?
Dr. Niziolek graduated from medical school in 2014, 12 years ago.
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