David S Klein, MD
David S Klein is a Diagnostic Radiology Physician provider (Radiology) practicing in Norwalk, CT, registered in the NPPES registry with NPI 1427021021 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1427021021 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | David S Klein |
| Credential | MD |
| Sex | Male |
| Practice address | 148 EAST AVE, Norwalk, CT, 06851 |
| Phone | 2038529913 |
| Enumeration date | 2006-02-13 |
| Last updated in NPPES | 2010-02-16 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 2085R0202X | Diagnostic Radiology Physician | Primary | 039370 | CT |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: David Klein, MD NPI: 1427021021 Taxonomy: 2085R0202X (Diagnostic Radiology Physician) Address: 148 EAST AVE, Norwalk, CT, 06851
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1992707616 | Richard Stieglitz | Individual | Physical Therapist | Norwalk, CT |
| 1326032285 | Andrew Parker | Individual | Otolaryngology Physician | Norwalk, CT |
| 1003897687 | Heather Frimmer | Individual | Diagnostic Radiology Physician | Norwalk, CT |
| 1699756023 | Steven Bernstein | Individual | Diagnostic Radiology Physician | Norwalk, CT |
| 1467436733 | Agnieszka Matczuk | Individual | Allergy & Immunology Physician | Norwalk, CT |
| 1174596902 | Avelino Maitem | Individual | Diagnostic Radiology Physician | Norwalk, CT |
| 1780657510 | Pradip Pathare | Individual | Radiation Oncology Physician | Norwalk, CT |
| 1912970732 | Alan Levine | Individual | Diagnostic Radiology Physician | Norwalk, CT |
Verify this record
Cross-check NPI 1427021021 against the authoritative CMS record: view David S Klein on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Where does David Klein practice?
What is the NPI number for David Klein?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2010-02-16.