Gregory Hertwig
NPI 1013303627 · Anesthesiology Physician · Spartanburg, SC
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Hertwig is a Anesthesiology Physician provider in Spartanburg, SC (NPI 1013303627).
Provider details
- NPI number
- 1013303627
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 83883 (SC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
268 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Insertion of Artery Tube for Blood Sampling Or Infusion Through Skin36620 | 46 | $41 |
| Ultrasonic Guidance for Blood Vessel Access76937 | 44 | $13 |
| Anesthesia for Exam of Colon Using an Endoscope00812 | 23 | $52 |
| Insertion of Probe in Esophagus for Heart Ultrasound93313 | 23 | $10 |
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 22 | $68 |
| Injection of Anesthetic Agent And/Or Steroid Into Rib Nerve64420 | 19 | $64 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$42 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-04-09
- Last updated
- 2020-07-24
- Certified
- 2020-07-24
Frequently asked questions
- What is Gregory Hertwig's NPI number?
- Gregory Hertwig's National Provider Identifier (NPI) is 1013303627, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Hertwig's specialty?
- Gregory Hertwig is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Hertwig located?
- Gregory Hertwig's practice location on file with NPPES is 101 E Wood St, Spartanburg, SC 29303-3040.
- What is Gregory Hertwig's phone number?
- The practice phone number listed in the NPPES registry for Gregory Hertwig is (864) 560-6122.
- Does Gregory Hertwig accept Medicare?
- Gregory Hertwig is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Hertwig's NPI active?
- Yes — Gregory Hertwig's NPI (1013303627) is active in the NPPES registry as of the last update on 2020-07-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.