Sapna Siddharth, MD
NPI 1538506357 · Critical Care Medicine (Internal Medicine) Physician · Springfield, IL
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sapna Siddharth, MD is a Critical Care Medicine (Internal Medicine) Physician provider in Springfield, IL (NPI 1538506357).
Provider details
- NPI number
- 1538506357
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 036145293 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
245 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 | 107 | $78 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 57 | $117 |
| Critical Care, First 30-74 Minutes99291 | 43 | $207 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 21 | $171 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 17 | $129 |
Typical Medicare-allowed amounts for these services range $78–$207 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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
Registry dates
- Enumerated
- 2013-06-03
- Last updated
- 2025-07-14
- Certified
- 2025-07-14
Frequently asked questions
- What is Sapna Siddharth's NPI number?
- Sapna Siddharth's National Provider Identifier (NPI) is 1538506357, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sapna Siddharth's specialty?
- Sapna Siddharth is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Sapna Siddharth located?
- Sapna Siddharth's practice location on file with NPPES is 701 N 1st St, Springfield, IL 62781.
- What is Sapna Siddharth's phone number?
- The practice phone number listed in the NPPES registry for Sapna Siddharth is (217) 528-7541.
- Does Sapna Siddharth accept Medicare?
- Sapna Siddharth is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sapna Siddharth's NPI active?
- Yes — Sapna Siddharth's NPI (1538506357) is active in the NPPES registry as of the last update on 2025-07-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.