Dr. Gregory Grimberg, MD
- Medicare services, 2024
- 745
- Medicare patients, 2024
- 135
- Part D claims, 2024
- 150
- MIPS score, 2024
- 82
- Hospital affiliations
- 5
- Practice address
- 1000 Fourth Street SW, Mason City, IA 50401
- Practice phone
- Call (641) 428-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Grimberg'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 Grimberg is a general surgeon in Mason City, Iowa
Dr. Grimberg practices at MercyOne North Iowa Medical Center in Mason City, Iowa, part of Trinity Health.
Dr. Grimberg's NPI, 1104245307, was assigned on April 15, 2014. Dr. Grimberg graduated from State University of New York Downstate Medical Center in 2014. Dr. Grimberg holds Iowa license MD-47527.
- NPI
- 1104245307NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446588305
- NPI enumeration date
- April 15, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (641) 428-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- 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. Gregory Grimberg practices at MercyOne North Iowa Medical Center in Mason City, Iowa
Dr. Grimberg's primary practice is MercyOne North Iowa Medical Center, at 1000 Fourth Street SW, Mason City, IA 50401 in Cerro Gordo County. The practice phone is (641) 428-7000.
- MercyOne North Iowa Medical Center1000 Fourth Street SW, Mason City, IA 50401 · Cerro Gordo CountyPhone(641) 428-7000
Source: Dmand AI Affiliation Data
Dr. Gregory Grimberg is affiliated with 8 sites of care and 2 medical groups
Dr. Grimberg's primary practice is MercyOne North Iowa Medical Center in Mason City, Iowa, part of Trinity Health. Dr. Grimberg is also affiliated with Floyd County Medical Center. The medical group on file is MercyOne North Iowa Anesthesia Professional Services. Dmand AI also links Dr. Grimberg to 3 more hospitals, 2 group practices and clinics, 1 hospice and 1 medical group, 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. Gregory Grimberg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grimberg practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MercyOne North Iowa Medical Center | Available with a free account |
| +7 more sites and 1 medical group | 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 Trinity Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Gregory Grimberg is one of 317 general surgeons in Iowa
Surgery is Dr. Grimberg's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Grimberg's licenses on file in 2 states: Iowa and Maryland.
Specialties and state licenses
- Surgery, IowaPrimary
- Maryland license
General surgeons near Dr. Grimberg
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 Grimberg billed Medicare for 745 services in 2024
CMS data shows 745 Medicare services from Dr. Grimberg across 14 procedure codes in 2024, for 135 Medicare patients. Medicare paid $71,119 for them.
Dr. Grimberg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3712024: 41211%
- Surgery
- 2023: 1242024: 1305%
- Tests and treatments
- 2023: 1202024: 10810%
- Other services
- 2023: 02024: 95
Where Dr. Grimberg's Medicare services took place, 2024
- In an office142%
- In a facility73198%
Dr. Grimberg compared with the Iowa median for general surgeons, 2024
- Dr. Grimberg
- Iowa median
- Medicare services
- 745vs 1644.5 times
- Medicare patients
- 135vs 1468% below
- Part D claims
- 78vs 4381% above
Medians across 332 general surgeons in Iowa with Dmand AI profiles that report each measure.
Dr. Grimberg'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. Grimberg?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grimberg and other general surgeons in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Grimberg treated 135 Medicare patients in 2024, average age 72
CMS counts 135 Medicare patients who saw Dr. Grimberg in 2024. The largest group is 75 to 84, with 47 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 24% are also on Medicaid. Their average risk score is 1.73, 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. Grimberg's median patient age at 71, with 60% women.
Dr. Grimberg's Medicare patients by age, 2024
Dr. Grimberg's Medicare patients by sex, 2024
- Women7556%
- Men6044%
Chronic conditions among Dr. Grimberg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis60%
- Mood disorders52%
- Depression49%
- Ischemic heart disease45%
- Anxiety41%
- Heart failure37%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grimberg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women60%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Grimberg wrote 150 Medicare Part D claims in 2024
In 2024, Dr. Grimberg wrote 150 Medicare Part D claims for 46 patients. 90% of them were for generic drugs. CMS names the drug for 78 of them, across 2 drugs with 11 or more claims each, at $1,363 in total drug cost. In 2023, CMS named 38 claims across 2 drugs.
Dr. Grimberg's Part D claims by kind of drug, 2024
- Generic135 claims90%
- Brand-name15 claims10%
Dr. Grimberg'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 382024: 78105%
Drugs named by CMS: 2 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
Dr. Gregory Grimberg scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Dr. Grimberg for performance year 2024, reported as part of a group. Dr. Grimberg accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 254 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Grimberg, more than 93% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Grimberg's MIPS scores, performance year 2024
- 82of 100Final score
- 73.9of 100Quality
- 93of 100Promoting Interoperability
- 40of 100Improvement Activities
- 70of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Grimberg ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 93rd percentile254 procedures
- Colonoscopy
- 46th percentile17 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Removal of skin lesions: 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)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Gregory Grimberg received $3,593 in industry payments from 2019 to 2025
CMS Open Payments shows 44 general payments to Dr. Grimberg from 18 drug and device companies from 2019 to 2025. Education make up the largest share, 56% of the total. Intuitive Surgical, Inc. paid the most, $2,409.
General payments to Dr. Grimberg by program year, 2019 to 2025
General payments to Dr. Grimberg by kind, 2019 to 2025
- Education$2,00056%
- Food and beverage$1,59344%
Companies that paid Dr. Grimberg the most, 2019 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory Grimberg graduated from State University of New York Downstate Medical Center
Dr. Grimberg graduated from State University of New York Downstate Medical Center in 2014.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Grimberg'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)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) |
| 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 Grimberg
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 Grimberg's NPI number?
Dr. Gregory Grimberg's NPI number is 1104245307. It was assigned on April 15, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Grimberg?
Dr. Gregory Grimberg is a general surgeon in Mason City, Iowa. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gregory Grimberg practice?
Dr. Grimberg practices at 1000 Fourth Street SW, Mason City, IA 50401. Dr. Grimberg's primary practice is MercyOne North Iowa Medical Center in Mason City, Iowa, part of Trinity Health. Dmand AI also links Dr. Grimberg to 3 hospitals, 2 group practices and clinics, 1 hospice and 1 medical group.
What is Dr. Gregory Grimberg's office phone number?
The practice phone on file for Dr. Grimberg is (641) 428-7000.
What is Dr. Gregory Grimberg's medical license number?
Dr. Grimberg holds Iowa license MD-47527, one of the licenses on file in 2 states.
Which states has Dr. Gregory Grimberg been licensed in?
Dmand AI has state licenses on file for Dr. Grimberg in Iowa and Maryland.
Which hospitals is Dr. Gregory Grimberg affiliated with?
Dr. Grimberg practices at MercyOne North Iowa Medical Center in Mason City, Iowa. Dr. Grimberg is also affiliated with Floyd County Medical Center. Dmand AI links Dr. Grimberg to 3 more hospitals.
What medical group is Dr. Gregory Grimberg part of?
Dr. Grimberg is linked to MercyOne North Iowa Anesthesia Professional Services. Dmand AI links Dr. Grimberg to 1 more medical group.
Does Dr. Gregory Grimberg accept Medicare?
Yes. CMS data shows Dr. Grimberg billed Medicare for 745 services in 2024, and Dr. Grimberg accepts Medicare assignment.
What is Dr. Gregory Grimberg's MIPS score?
Dr. Grimberg's MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
Show 6 more questionsShow fewer questions
How many Medicare patients does Dr. Gregory Grimberg see?
CMS counts 135 Medicare patients who saw Dr. Grimberg in 2024, with an average age of 72.
What services does Dr. Gregory Grimberg bill to Medicare?
In 2024, Dr. Grimberg's most billed Medicare services were office visit, established patient (99215), hospital inpatient care (99232) and medicare service (G2211).
Where did Dr. Gregory Grimberg go to medical school?
Dr. Grimberg graduated from State University of New York Downstate Medical Center in 2014.
What drugs does Dr. Gregory Grimberg prescribe most?
In 2024 Medicare Part D data, Dr. Grimberg's most prescribed drugs by claims were Pantoprazole Sodium and Sucralfate.
Has Dr. Gregory Grimberg received payments from drug or device companies?
CMS Open Payments shows $3,593 in general payments to Dr. Grimberg from 18 companies from 2019 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Gregory Grimberg been practicing?
Dr. Grimberg graduated from medical school in 2014, 12 years ago.
Selling to surgery practices?
See general surgeons in Iowa by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card