Doctor profile · Federal record
Dr. Siddharth Tambar, MD
Rheumatology Physician (CMS: Rheumatology) · Internal Medicine Physician · Chicago, IL
- NPI 1477655488
- Accepts Medicare
- 25 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
618 W Fulton St
Chicago, IL 606611144
(773) 348-7171
fax (737) 348-7414
Credentials & registration
- NPI registered
- September 2006 — 20 yrs on file
- Profile last updated
- February 25, 2026
- Year of graduation
- 2001 — 25 yrs since
- Specialty taxonomy
- 207RR0500X — NUCC code
- State license (1)
- Illinois #036-111655
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1477655488. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
12,174
Distinct HCPCS
9
Medicare allowed
$216,196
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J1602 |
Injection, golimumab, 1 mg, for intravenous use | 11,600 | 11 | $13 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 152 | 69 | $93 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 150 | 67 | $131 | |
76881 |
Complete ultrasound scan of joint | 107 | 61 | $56 | |
96413 |
Administration of chemotherapy into vein, 1 hour or less | 86 | 15 | $136 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 33 | 33 | $171 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 18 | 13 | $94 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 15 | 15 | $232 | |
J1030 |
Injection, methylprednisolone acetate, 40 mg | 13 | 12 | $8 |
In context: peer comparison
Among 36 peers in Chicago Rheumatology Physician, average services per provider: 1,230. This provider delivers 9.9× the peer median.Open Payments
Industry payments received
All-time total
$683
Transactions
26
Manufacturers
8
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Alexion Pharmaceuticals, INC. | 8 | $206.82 | |
| Amgen INC. | 4 | $91.46 | |
| Genzyme Corporation | 3 | $84.09 | |
| Pfizer INC. | 3 | $76.94 | |
| Novartis Pharmaceuticals Corporation | 2 | $66.40 | |
| Abbvie INC. | 2 | $58.78 | |
| Ucb, INC. | 2 | $56.39 | |
| GlaxoSmithKline, LLC. | 2 | $41.97 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
132
Patients
38
Total drug cost
$126,392
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Methotrexate (Methotrexate Sodium) | Brand | 30 | 14 | $1,717 |
| Hydroxychloroquine Sulfate | Generic | 25 | 13 | $1,160 |
| Leflunomide | Generic | 22 | 0 | $2,759 |
| Prednisone | Generic | 22 | 11 | $95 |
| Actemra (Tocilizumab) | Brand | 11 | 0 | $45,289 |
| Benlysta (Belimumab) | Brand | 11 | 0 | $74,215 |
| Sulfasalazine Dr (Sulfasalazine) | Brand | 11 | 0 | $1,157 |
Hospital affiliations
Frequently asked questions
What is Dr. Siddharth Tambar's medical specialty?
Dr. Siddharth Tambar practices Rheumatology Physician in Chicago, IL.
Where does Dr. Siddharth Tambar practice?
Dr. Siddharth Tambar practices at 618 W Fulton St, Chicago, IL 606611144. Office phone: 7733487171.
What is Dr. Siddharth Tambar's NPI?
Dr. Siddharth Tambar's National Provider Identifier (NPI) is 1477655488, issued by NPPES.
Does Dr. Siddharth Tambar accept Medicare assignment?
Yes. Dr. Siddharth Tambar accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Siddharth Tambar commonly perform?
Top Medicare-reported procedures in 2023: Injection, golimumab, 1 mg, for intravenous use (HCPCS J1602); Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.