DR. NATHAN DANIEL MARK D.O.
NPI 1902973993
Anesthesiology in Hartford, CT
About Dr. Nathan Daniel Mark D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHAN DANIEL MARK D.O. (NPI 1902973993) is an individual anesthesiology provider in Hartford, Connecticut, licensed in Connecticut (050791) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Durango, and is a graduate of New York College Of Osteo Medicine Of New York Institute Of Technology (2005).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Nathan Daniel Mark D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Nathan Mark reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Lamar, CO 81052
- Reassigned Medicare billing, Colorado enrollment
- 1,193 clinicians in this Medicare group
Greenwood Village, CO 80111
- Reassigned Medicare billing, Colorado enrollment
- 971 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 9
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HARTFORD, CT 06106
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Nathan Mark's NPI number?
The NPI number for Nathan Mark is 1902973993. It was assigned to this individual provider in the NPPES registry on November 29, 2006.
Where is Nathan Mark located?
Nathan Mark practices at 80 Seymour St, Hartford, CT 06106. The listed phone number is (860) 545-2117.
What is Nathan Mark's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Nathan Mark enrolled in Medicare?
Yes. Nathan Mark is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Nathan Mark's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathan Mark reassigns Medicare benefits to 2 organizations: Catholic Health Initiatives Colorado (Lamar, CO) and Us Anesthesia Partners Of Colorado Inc. (Greenwood Village, CO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nathan Mark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nathan Mark accept?
Health plans from Blue Cross Blue Shield of Arizona list Nathan Mark as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Nathan Mark was last updated on October 3, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Nathan Daniel Mark, D.O. · NPI 1902973993
Anesthesiology physician in Hartford, Connecticut. Individual provider, active in the CMS NPPES registry since November 29, 2006.
## Identity
- **NPI:** 1902973993 (Entity type: Individual)
- **Enumerated:** November 29, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 050791 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 80 SEYMOUR ST, Hartford, CT 06106-3315
- **Phone:** (860) 545-2117
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Catholic Health Initiatives Colorado (NPI 1679182315, Lamar, CO); Us Anesthesia Partners Of Colorado Inc. (NPI 1922365782, Greenwood Village, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York College Of Osteo Medicine Of New York Institute Of Technology, class of 2005
## Record status
- **NPPES last updated:** October 3, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1902973993) · Data from the CMS NPPES public registry.