Carl W. Nissen, MD
Orthopaedic Surgery Physician · Hartford, CT
Carl W. Nissen, MD is an orthopaedic surgery physician with a practice address in Hartford, Connecticut, and NPI 1982601530, issued on Jun 28, 2005. Check the license (Connecticut 033613, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Carl W. Nissen
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License numbers
- 033613 CT
33613 CT
Self-reported in NPPES; status is on the state search - Practice location
- 31 Seymour St Ste 204, Hartford, CT 06106
- Phone
- (860) 421-3233
- Enumerated
- Jun 28, 2005
- Record last updated
- Nov 19, 2025
- Medicare enrollment
- Enrolled (PECOS I20060215000519); may accept Medicare assignment
- Medical or professional school
- University Of Connecticut School Of Medicine, 1990
- Entity
- Type 1 · individual
Also registered at 31 Seymour St Ste 204
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tammy Gendron, PA-CMedical Physician Assistant1831387596
Verify Carl W. Nissen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 033613Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
54 Medicare Part D claims for 21 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D.
Most prescribed
- Ibuprofen22 claims
- Diclofenac Sodium12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $124.99
1 payment: food and beverage; the largest payer was Vericel Corporation. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
One hospital affiliation
- Hartford HospitalHartford, CT · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Orthopaedic Surgery Physician providers in Connecticut
There are 348 orthopaedic surgery physician records in Connecticut.
Other orthopaedic surgery physician records in Connecticut
- Kenneth Alleyne, MDSouth Windsor, CT1316991136
- Mark Altman, M.D.Hamden, CT1689652711
- Kelms Amoo-Achampong, MDFairfield, CT1215461736
- Kenoma Anighoro, M.D.Branford, CT1881088177
- Christopher Antonacci, MD, MPHFarmington, CT1073192662
- Abiola Atanda, M.DDanbury, CT1477814671
- John Awad, MDFairfield, CT1447280052
- John Axline, M.D.Fairfield, CT1972650281
- Alfredo Axtmayer, MDWallingford, CT1598747602
- Sarah Ballatori, MDNew Haven, CT1366002438
Common questions
What is Carl W. Nissen, MD's NPI number?
Carl W. Nissen, MD's National Provider Identifier (NPI) is 1982601530, issued on Jun 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Carl W. Nissen, MD located?
The NPPES record lists a practice address at 31 Seymour St Ste 204, Hartford, CT, 06106. Phone: (860) 421-3233. Providers update this record themselves, so call before visiting.
How can I verify Carl W. Nissen, MD's license?
NPPES lists Connecticut license number 033613, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Carl W. Nissen, MD prescribe under Medicare Part D?
In 2024, Carl W. Nissen, MD had 54 Medicare Part D claims for 21 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
What is Carl W. Nissen, MD's MIPS final score?
The 2023 MIPS final score is 86.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.