Katherine Riordan, MD
NPI 1225923329 · Neurological Surgery Physician · Chicago, IL
Enrolled with Medicare as Order and Referring Only - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Riordan, MD is a Neurological Surgery Physician provider in Chicago, IL (NPI 1225923329).
Provider details
- NPI number
- 1225923329
- Entity type
- Individual
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2025-06-10
- Last updated
- 2025-07-28
- Certified
- 2025-07-28
Frequently asked questions
- What is Katherine Riordan's NPI number?
- Katherine Riordan's National Provider Identifier (NPI) is 1225923329, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Riordan's specialty?
- Katherine Riordan is listed in the NPPES registry with a primary specialty of Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Riordan located?
- Katherine Riordan's practice location on file with NPPES is 1725 W Harrison St Ste 855, Chicago, IL 60612-5113.
- What is Katherine Riordan's phone number?
- The practice phone number listed in the NPPES registry for Katherine Riordan is (312) 942-6644.
- Does Katherine Riordan accept Medicare?
- Katherine Riordan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Riordan's NPI active?
- Yes — Katherine Riordan's NPI (1225923329) is active in the NPPES registry as of the last update on 2025-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.