DR. JOHN CHARLES DIECK D.O.
NPI 1205899226
Anesthesiology in Waterbury, CT
About Dr. John Charles Dieck D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN CHARLES DIECK D.O. (NPI 1205899226) is an individual anesthesiology provider in Waterbury, Connecticut, licensed in Connecticut (000505) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses
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. John Charles Dieck 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 John Dieck reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Torrington, CT 06790
- Reassigned Medicare billing, Connecticut enrollment
- 64 clinicians in this Medicare group
Danbury, CT 06810
- Reassigned Medicare billing, Connecticut enrollment
- 818 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 3
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.
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.
WATERBURY, CT 06708
WATERBURY, CT 06708
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 John Dieck's NPI number?
The NPI number for John Dieck is 1205899226. It was assigned to this individual provider in the NPPES registry on April 10, 2006.
Where is John Dieck located?
John Dieck practices at 140 Grandview Ave, Waterbury, CT 06708. The listed phone number is (203) 757-7000.
What is John Dieck's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is John Dieck enrolled in Medicare?
Yes. John Dieck 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 John Dieck's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Dieck reassigns Medicare benefits to 2 organizations: Resource Anesthesiology Associates Of Ct PC (Torrington, CT) and Nuvance Health Medical Practice Ct, Inc. (Danbury, 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 John Dieck's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Dieck was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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. John Charles Dieck, D.O. · NPI 1205899226
Anesthesiology physician in Waterbury, Connecticut. Individual provider, active in the CMS NPPES registry since April 10, 2006.
## Identity
- **NPI:** 1205899226 (Entity type: Individual)
- **Enumerated:** April 10, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 000505 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 140 GRANDVIEW AVE, Waterbury, CT 06708-2505
- **Phone:** (203) 757-7000
## 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): Resource Anesthesiology Associates Of Ct PC (NPI 1447233176, Torrington, CT); Nuvance Health Medical Practice Ct, Inc. (NPI 1407898117, Danbury, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1205899226) · Data from the CMS NPPES public registry.