Quick answers
- Does Nehemiah T. Tan accept Medicare assignment?
- Yes. Medicare's clinician data says Nehemiah T. Tan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Nehemiah T. Tan see?
- In 2024, CMS data shows 511 Original Medicare patients and 20,300 services for Nehemiah T. Tan. This counts Original Medicare only and measures volume, not quality.
- What is Nehemiah T. Tan's NPI number?
- 1578520995. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Nehemiah T. Tan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 511 |
|---|---|
| Services billed to Medicare | 20,300 |
| Different services or procedures | 23 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered) (J0129)12,775 services
- Injection, infliximab, excludes biosimilar, 10 mg (J1745)2,180 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)856 services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)470 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)302 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis75%
- Ischemic heart disease38%
- Diabetes26%
- Anxiety26%
Hospitals where Nehemiah T. Tan works
Medicare's Facility Affiliation Data lists Nehemiah T. Tan at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Decatur Memorial HospitalDecatur, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140135
- Fayette County HospitalVandalia, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141346
- Pana Community HospitalPana, IL · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 141341
- Sarah Bush Lincoln Health CenterMattoon, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140189
- St Marys HospitalDecatur, IL · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 140166
Practice locations
Addresses where Nehemiah T. Tan is enrolled with Medicare (CMS data updated October 2, 2026).
- 200 Richmond Ave E, Suite 3Mattoon, IL 61938 (217) 234‑7000
Group practices
Medicare enrollment lists Nehemiah T. Tan as a member of this group (CMS data updated October 2, 2026).
- Sarah Bush Lincoln Health Center419 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Other clinicians in Sarah Bush Lincoln Health Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578520995 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians