John Klein
NPI 1669834313 · Surgery Physician · Chicago, IL
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Klein is a Surgery Physician provider in Chicago, IL (NPI 1669834313).
Provider details
- NPI number
- 1669834313
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- MD494214 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
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
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
48 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 34 | $81 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 14 | $95 |
Typical Medicare-allowed amounts for these services range $81–$95 (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
Additional practice locations (3)
- 1450 San Pablo St #2000Los Angeles, CA 90089-3833Phone: (800) 872-2273
- 1653 W Congress PkwyChicago, IL 60612-3833Phone: (312) 942-5000
- 2201 Brunswick Dr Ste 2300Hanover, PA 17331-8350Phone: (717) 316-7165Fax: (717) 316-1611
Registry dates
- Enumerated
- 2016-03-22
- Last updated
- 2026-04-30
- Certified
- 2026-04-30
Frequently asked questions
- What is John Klein's NPI number?
- John Klein's National Provider Identifier (NPI) is 1669834313, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Klein's specialty?
- John Klein is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is John Klein located?
- John Klein's practice location on file with NPPES is 1725 W Harrison St, Chicago, IL 60612-3841.
- What is John Klein's phone number?
- The practice phone number listed in the NPPES registry for John Klein is (312) 942-4252.
- Does John Klein accept Medicare?
- John Klein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Klein's NPI active?
- Yes — John Klein's NPI (1669834313) is active in the NPPES registry as of the last update on 2026-04-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.