THEODORE R HARTENSTEIN MD
NPI 1225256308
Hospitalist in Hartford, CT
About Theodore R Hartenstein Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THEODORE R HARTENSTEIN MD (NPI 1225256308) is an individual hospitalist provider in Hartford, Connecticut, licensed in Connecticut (49573) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS and is a graduate of University Of Massachusetts Medical School (2006).
NPPES Registry Identity
Specialties & Licenses 2
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
Theodore R Hartenstein Md 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 Theodore Hartenstein reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hartford, CT 06105
- Reassigned Medicare billing, Connecticut enrollment
- 1,186 clinicians in this Medicare group
Middletown, CT 06457
- Reassigned Medicare billing, Connecticut enrollment
- 178 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 2
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06105 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 06105
HARTFORD, CT 06105
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 Theodore Hartenstein's NPI number?
The NPI number for Theodore Hartenstein is 1225256308. It was assigned to this individual provider in the NPPES registry on April 23, 2007.
Where is Theodore Hartenstein located?
Theodore Hartenstein practices at 114 Woodland St Dept. Of Medicine, Hartford, CT 06105. The listed phone number is (860) 714-7446.
What is Theodore Hartenstein's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Theodore Hartenstein enrolled in Medicare?
Yes. Theodore Hartenstein 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 Theodore Hartenstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Theodore Hartenstein reassigns Medicare benefits to 2 organizations: Trinity Health Of New England Provider Network Organization Inc (Hartford, CT) and Middlesex Hospital (Middletown, CT). 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 Theodore Hartenstein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Theodore Hartenstein accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Theodore Hartenstein 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 Theodore Hartenstein was last updated on March 16, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Theodore R Hartenstein, MD · NPI 1225256308
Hospitalist physician in Hartford, Connecticut. Individual provider, active in the CMS NPPES registry since April 23, 2007.
## Identity
- **NPI:** 1225256308 (Entity type: Individual)
- **Enumerated:** April 23, 2007
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 49573 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 114 WOODLAND ST, DEPT. OF MEDICINE, Hartford, CT 06105-1208
- **Phone:** (860) 714-7446 · **Fax:** (860) 714-1508
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Trinity Health Of New England Provider Network Organization Inc (NPI 1003882812, Hartford, CT); Middlesex Hospital (NPI 1972563138, Middletown, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 2006
## Record status
- **NPPES last updated:** March 16, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1225256308) · Data from the CMS NPPES public registry.