Jonathan Kirshner
NPI 1235584509 · Infectious Disease Physician · Norwalk, CT
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Kirshner is a Infectious Disease Physician provider in Norwalk, CT (NPI 1235584509).
Provider details
- NPI number
- 1235584509
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 313469 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
40 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 14 | $183 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 13 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 13 | $155 |
Typical Medicare-allowed amounts for these services range $8–$183 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-04-25
- Last updated
- 2025-07-09
- Certified
- 2025-07-09
Frequently asked questions
- What is Jonathan Kirshner's NPI number?
- Jonathan Kirshner's National Provider Identifier (NPI) is 1235584509, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Kirshner's specialty?
- Jonathan Kirshner is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Kirshner located?
- Jonathan Kirshner's practice location on file with NPPES is 761 Main Ave Ste 114a, Norwalk, CT 06851-1080.
- What is Jonathan Kirshner's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Kirshner is (203) 852-2280.
- Does Jonathan Kirshner accept Medicare?
- Jonathan Kirshner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Kirshner's NPI active?
- Yes — Jonathan Kirshner's NPI (1235584509) is active in the NPPES registry as of the last update on 2025-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.