Robert Katz, M.D.
NPI 1790875797 · Rheumatology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Katz, M.D. is a Rheumatology Physician provider in Chicago, IL (NPI 1790875797).
Provider details
- NPI number
- 1790875797
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036053574 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
10,434 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Measurement of Antibody for Assessment of Autoimmune Disorder, Any Method86235 | 5,528 | $18 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 745 | $88 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 727 | $9 |
| Vitamin D-3 Level82306 | 719 | $29 |
| Measurement of Antibody for Rheumatoid Arthritis Assessment86200 | 691 | $13 |
| Measurement of Dna Antibody, Native Or Double Stranded86225 | 691 | $13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 71 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 536 | 160 |
| Methotrexate Sodiumbrand: Methotrexate | 188 | 52 |
| Cyclobenzaprine Hcl | 140 | 48 |
| Amitriptyline Hcl | 100 | 27 |
| Celecoxib | 90 | 27 |
| Tramadol Hcl | 87 | 19 |
| Meloxicam | 79 | 29 |
| Levothyroxine Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$93 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-13
- Last updated
- 2019-11-20
Frequently asked questions
- What is Robert Katz's NPI number?
- Robert Katz's National Provider Identifier (NPI) is 1790875797, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Katz's specialty?
- Robert Katz is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Katz located?
- Robert Katz's practice location on file with NPPES is 1725 W Harrison St Ste 365, Chicago, IL 60612-3836.
- What is Robert Katz's phone number?
- The practice phone number listed in the NPPES registry for Robert Katz is (312) 226-8228.
- Does Robert Katz accept Medicare?
- Robert Katz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Katz's NPI active?
- Yes — Robert Katz's NPI (1790875797) is active in the NPPES registry as of the last update on 2019-11-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.