Gregory Fredrick Hertwig
- Medicare services, 2024
- 268
- Medicare patients, 2024
- 293
- MIPS score, 2024
- 95
- Hospital affiliations
- 3
- Industry payments
- $1,747
- Practice address
- 101 E Wood St, Spartanburg, SC 29303
- Practice phone
- Call (864) 560-6554
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Gregory Hertwig'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.
Gregory Fredrick Hertwig is an anesthesiologist in Spartanburg, South Carolina
Gregory Hertwig practices at Spartanburg Medical Center in Spartanburg, South Carolina, part of Spartanburg Regional Healthcare System.
Gregory Hertwig's NPI, 1013303627, was assigned on April 9, 2015. Gregory Hertwig graduated from University of South Carolina School of Medicine in 2015. Gregory Hertwig holds South Carolina license 83883.
- NPI
- 1013303627NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4880903525
- NPI enumeration date
- April 9, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (864) 560-6554
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Gregory Fredrick Hertwig practices at Spartanburg Medical Center in Spartanburg, South Carolina
Gregory Hertwig's primary practice is Spartanburg Medical Center, at 101 E Wood St, Spartanburg, SC 29303 in Spartanburg County. The practice phone is (864) 560-6554.
- Spartanburg Medical Center101 E Wood St, Spartanburg, SC 29303 · Spartanburg CountyPhone(864) 560-6554
Source: Dmand AI Affiliation Data
Gregory Fredrick Hertwig is affiliated with 3 sites of care and 2 medical groups
Gregory Hertwig's primary practice is Spartanburg Medical Center in Spartanburg, South Carolina, part of Spartanburg Regional Healthcare System. Gregory Hertwig is also affiliated with Pelham Medical Center. The medical group on file is MUSC Community Physicians. Dmand AI also links Gregory Hertwig to 1 more hospital 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 Gregory Fredrick Hertwig's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gregory Hertwig practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Spartanburg Medical Center | Available with a free account |
| +2 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 Spartanburg Regional Healthcare System and 6.2K+ hospitals, with verified contacts in the same login.
Gregory Fredrick Hertwig is one of 626 anesthesiologists in South Carolina
Anesthesiology is Gregory Hertwig's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Gregory Hertwig is licensed in South Carolina.
Specialties and state licenses
- Anesthesiology, South CarolinaPrimary
Anesthesiologists near Gregory Hertwig
Counts of anesthesiologists 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
Gregory Fredrick Hertwig billed Medicare for 268 services in 2024
CMS data shows 268 Medicare services from Gregory Hertwig across 13 procedure codes in 2024, for 293 Medicare patients. Medicare paid $16,059 for them. Every service was in a facility, such as a hospital, rather than an office.
Gregory Hertwig's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 1172024: 1181%
- Surgery
- 2023: 1092024: 8324%
- Imaging
- 2023: 722024: 4439%
- Tests and treatments
- 2023: 322024: 2328%
Gregory Hertwig compared with the South Carolina median for anesthesiologists, 2024
- Gregory Hertwig
- South Carolina median
- Medicare services
- 268vs 20034% above
- Medicare patients
- 293vs 282Close to median
Medians across 637 anesthesiologists in South Carolina with Dmand AI profiles that report each measure.
Gregory Hertwig'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 Gregory Hertwig?
Medicare shows one payer. Book a meeting to get commercial claims data for Gregory Hertwig and other anesthesiologists in South Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Gregory Fredrick Hertwig treated 293 Medicare patients in 2024, average age 73
CMS counts 293 Medicare patients who saw Gregory Hertwig in 2024. The largest group is 65 to 74, with 124 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.96, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Gregory Hertwig's median patient age at 68, with 56% women.
Gregory Hertwig's Medicare patients by age, 2024
Gregory Hertwig's Medicare patients by sex, 2024
- Women12342%
- Men17058%
Chronic conditions among Gregory Hertwig's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis51%
- Chronic kidney disease43%
- Diabetes42%
- Ischemic heart disease39%
- Anxiety38%
- Atrial fibrillation38%
Share of Medicare patients with each condition. A patient can have several.
Gregory Hertwig's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Gregory Fredrick Hertwig scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Gregory Hertwig for performance year 2024, reported through an alternative payment model (APM). Gregory Hertwig accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Gregory Hertwig's MIPS scores, performance year 2024
- 95of 100Final score
- 89.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
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
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.
Gregory Fredrick Hertwig received $1,747 in industry payments from 2021 to 2025
CMS Open Payments shows 16 general payments to Gregory Hertwig from 9 drug and device companies from 2021 to 2025. Travel and lodging make up the largest share, 54% of the total. Edwards Lifesciences Corporation paid the most, $1,280.
General payments to Gregory Hertwig by program year, 2021 to 2025
General payments to Gregory Hertwig by kind, 2021 to 2025
- Travel and lodging$95254%
- Food and beverage$79546%
Companies that paid Gregory Hertwig the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Gregory Fredrick Hertwig graduated from University of South Carolina School of Medicine
Gregory Hertwig graduated from University of South Carolina School of Medicine in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Gregory Fredrick Hertwig'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) |
| 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 Gregory Fredrick Hertwig
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Gregory Fredrick Hertwig's NPI number?
Gregory Fredrick Hertwig's NPI number is 1013303627. It was assigned on April 9, 2015, and it is active in the NPI Registry.
What does Gregory Fredrick Hertwig specialize in?
Gregory Fredrick Hertwig is an anesthesiologist in Spartanburg, South Carolina. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Gregory Fredrick Hertwig practice?
Gregory Hertwig practices at 101 E Wood St, Spartanburg, SC 29303. Gregory Hertwig's primary practice is Spartanburg Medical Center in Spartanburg, South Carolina, part of Spartanburg Regional Healthcare System. Dmand AI also links Gregory Hertwig to 1 hospital and 1 medical group.
What is Gregory Fredrick Hertwig's office phone number?
The practice phone on file for Gregory Hertwig is (864) 560-6554.
What is Gregory Fredrick Hertwig's medical license number?
Gregory Hertwig holds South Carolina license 83883.
Which hospitals is Gregory Fredrick Hertwig affiliated with?
Gregory Hertwig practices at Spartanburg Medical Center in Spartanburg, South Carolina. Gregory Hertwig is also affiliated with Pelham Medical Center. Dmand AI links Gregory Hertwig to 1 more hospital.
What medical group is Gregory Fredrick Hertwig part of?
Gregory Hertwig is linked to MUSC Community Physicians. Dmand AI links Gregory Hertwig to 1 more medical group.
Does Gregory Fredrick Hertwig accept Medicare?
Yes. CMS data shows Gregory Hertwig billed Medicare for 268 services in 2024, and Gregory Hertwig accepts Medicare assignment.
What is Gregory Fredrick Hertwig's MIPS score?
Gregory Hertwig's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Gregory Fredrick Hertwig see?
CMS counts 293 Medicare patients who saw Gregory Hertwig in 2024, with an average age of 73.
Show 4 more questionsShow fewer questions
What services does Gregory Fredrick Hertwig bill to Medicare?
In 2024, Gregory Hertwig's most billed Medicare services were surgery: heart and blood vessels (36620), ultrasound (76937) and anesthesia (00812).
Where did Gregory Fredrick Hertwig go to medical school?
Gregory Hertwig graduated from University of South Carolina School of Medicine in 2015.
Has Gregory Fredrick Hertwig received payments from drug or device companies?
CMS Open Payments shows $1,747 in general payments to Gregory Hertwig from 9 companies from 2021 to 2025. The largest total came from Edwards Lifesciences Corporation.
How long has Gregory Fredrick Hertwig been practicing?
Gregory Hertwig graduated from medical school in 2015, 11 years ago.
Selling to anesthesiology practices?
See anesthesiologists in South Carolina 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