Nathan Mark, D.O.
NPI 1902973993 · Anesthesiology Physician · Hartford, CT
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Mark, D.O. is a Anesthesiology Physician provider in Hartford, CT (NPI 1902973993).
Provider details
- NPI number
- 1902973993
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- CDRH.0057872 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
241 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Anesthesia for Lens Surgery00142 | 93 | $79 |
| Anesthesia for Procedure for Total Knee Joint Replacement01402 | 28 | $234 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 25 | $91 |
| Continuous Infusion of Anesthetic Agent And/Or Steroid Into Thigh Nerve (femoral Nerve) Through Catheter64448 | 24 | $69 |
| Anesthesia for Retinal Surgery00145 | 23 | $130 |
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 13 | $111 |
Practice location
Mailing address
Additional practice locations (1)
- 1010 Three Springs BlvdDurango, CO 81301-8296Phone: (970) 761-3200Fax: (970) 764-3209
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2024-10-03
- Certified
- 2024-10-03
Frequently asked questions
- What is Nathan Mark's NPI number?
- Nathan Mark's National Provider Identifier (NPI) is 1902973993, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathan Mark's specialty?
- Nathan Mark is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Mark located?
- Nathan Mark's practice location on file with NPPES is 80 Seymour St, Hartford, CT 06106-3315.
- What is Nathan Mark's phone number?
- The practice phone number listed in the NPPES registry for Nathan Mark is (860) 545-2117.
- Does Nathan Mark accept Medicare?
- Nathan Mark is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathan Mark's NPI active?
- Yes — Nathan Mark's NPI (1902973993) is active in the NPPES registry as of the last update on 2024-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.