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Compare the published Medicare service mix of Walter John Marbach, MD with clinicians in the same registry specialty: Rheumatology (CMS).

CRESTWOOD, IL · 10 milesEdit location
Within 10 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 16 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Phyllis N Bonaminio, MD

Internal Medicine · Rheumatology (CMS) · Oak Lawn, IL

Shared published services
3 shared services · view billing descriptions
  • Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less (96365)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
51%Service-mix similarity~4.8 milesView profile →

Sunil Cherian John, MD

Internal Medicine · Rheumatology (CMS) · Orland Park, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Injection of drug or substance under skin or into muscle (96372)
  • Insertion of needle into vein for collection of blood sample (36415)
41%Service-mix similarity~8.2 milesView profile →

Cory L Conniff, MD

Internal Medicine · Rheumatology (CMS) · Orland Park, IL

Shared published services
3 shared services · view billing descriptions
  • Administration of chemotherapy into vein, 1 hour or less (96413)
  • Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle (96401)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
40%Service-mix similarity~8.2 milesView profile →

Veena Nayak, M.D.

Rheumatology (CMS) · Olympia Fields, IL

Shared published services
3 shared services · view billing descriptions
  • Administration of chemotherapy into vein, 1 hour or less (96413)
  • Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle (96401)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
37%Service-mix similarity~9.7 milesView profile →

Sleiman Raddawi, M.D

Rheumatology (CMS) · Oak Lawn, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
35%Service-mix similarity~4.8 milesView profile →

Aravind Gopal, MD

Internal Medicine · Rheumatology (CMS) · Olympia Fields, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
32%Service-mix similarity~9.7 milesView profile →

Joy Iskandar, D.O.

Rheumatology (CMS) · South Holland, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
31%Service-mix similarity~8.3 milesView profile →

Mihaela Mihailescu, MD

Internal Medicine · Rheumatology (CMS) · Oak Lawn, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
28%Service-mix similarity~4.8 milesView profile →

Olga M Vila-Sola, MD

Internal Medicine · Rheumatology (CMS) · Orland Park, IL

Shared published services
2 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
26%Service-mix similarity~8.2 milesView profile →

Fariha Kausar, MD

Rheumatology (CMS) · Orland Park, IL

Shared published services
2 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
26%Service-mix similarity~5.5 milesView profile →

Laarni Quimson, D.O.

Rheumatology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
25%Service-mix similarity~5.6 milesView profile →

Charles E Geringer, M.D.

Internal Medicine · Rheumatology (CMS) · Palos Heights, IL

Shared published services
2 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
21%Service-mix similarity~2.9 milesView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in approximate distance order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.