Quick answers
- Does Day S. Lennep accept Medicare assignment?
- Yes. Medicare's clinician data says Day S. Lennep 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 Day S. Lennep see?
- In 2024, CMS data shows 521 Original Medicare patients and 153,593 services for Day S. Lennep. This counts Original Medicare only and measures volume, not quality.
- What is Day S. Lennep's NPI number?
- 1538509955. 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 Day S. Lennep, 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 | 521 |
|---|---|
| Services billed to Medicare | 153,593 |
| Different services or procedures | 90 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Injection, tocilizumab, 1 mg (J3262)80,160 services
- Injection, golimumab, 1 mg, for intravenous use (J1602)24,300 services
- Injection, certolizumab pegol, 1 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) (J0717)13,600 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)7,400 services
- Injection, infliximab, excludes biosimilar, 10 mg (J1745)5,990 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%
- Arthritis75%
- High cholesterol71%
- Diabetes33%
- Osteoporosis31%
- Ischemic heart disease26%
Hospitals where Day S. Lennep works
Medicare's Facility Affiliation Data lists Day S. Lennep 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.
- Mississippi Baptist Medical CenterJackson, MS · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 250102
Practice locations
Addresses where Day S. Lennep is enrolled with Medicare (CMS data updated October 2, 2026).
- 971 Lakeland Dr, Suite 950Jackson, MS 39216 (601) 362‑6900
Group practices
Medicare enrollment lists Day S. Lennep as a member of this group (CMS data updated October 2, 2026).
- Mississippi Arthritis Clinic PLLC8 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Jackson
Clinicians with the same Medicare primary specialty in Jackson, MS — not a recommendation.
Other clinicians in Mississippi Arthritis Clinic PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Mississippi School Of Medicine |
| Graduation year | 2013 (13 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538509955 |
| 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