Physician Profile
Day S. Lennep, M.D.
Unclaimed ProfileAbout Dr. Lennep
Day S. Lennep, M.D. practices internal medicine in Jackson, MS. Day is a 2013 graduate of University of Mississippi School of Medicine. Medicare claims data shows Day provided 144,661 services to 3,523 patients. The services billed most often include injection, tocilizumab, 1 mg, injection, golimumab, 1 mg, for intravenous use, and 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).
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (601) 984-5601
- Email not available
Practice Locations
2500 N STATE ST
Jackson, MS 39216
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
- High blood pressure
- High cholesterol
Digestive and liver
- Acid reflux
- Fatty liver disease
- IBS
Endocrine, blood, and bone
- Gout
Infectious disease
Kidney and urinary
Respiratory
- Acute bronchitis
- Asthma
- COPD
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
- Overactive Bladder and Leakage
Lungs & Breathing
Mental Health
- Generalized anxiety disorder
- Insomnia and Sleep Problems
Neurologic and behavioral
- Depression
- Migraines
Pain
- Back pain
Rheumatologic and pain
- Osteoarthritis
Procedures & services
Most searched procedures
Preventive and evaluation
- Medication management
- Post-hospital transitional care
Screening and diagnostic testing
Bones & Joints
Brain and nerves
- Epley Maneuver
Cancer screening
Digestive
Exams & Consultations
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart health
Imaging referral
Immunizations
Lab tests
Lungs & Breathing
Metabolic & Weight
Minor procedures
Office procedures
Office Procedures
- Skin Tag and Mole Removal
- Vitamin B12 Injections
- Wart Removal
Pain management
Preventive & Routine Care
Screenings & Diagnostics
Sexual health
Procedures Most Often Billed to Medicare
144,661 services · 3,523 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
1,124 | More than most peers in Internal Medicine |
| X-ray of hand, 2 views | Imaging | 73120 |
106 | Too few peers to compare |
| Administration of chemotherapy into vein, 1 hour or less | Treatment | 96413 |
561 | More than most peers in Internal Medicine |
| Administration of chemotherapy into vein, each additional hour | Treatment | 96415 |
197 | More often than most peers in Internal Medicine |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
127 | More often than most peers in Internal Medicine |
| Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle | Treatment | 96401 |
68 | As often as other peers in Internal Medicine |
| Injection, tocilizumab, 1 mg | Drug given | J3262 |
80,160 | More than most peers in Internal Medicine |
| Injection, golimumab, 1 mg, for intravenous use | Drug given | J1602 |
24,300 | More than most peers in Internal Medicine |
| 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) | Drug given | J0717 |
13,600 | Less often than most peers in Internal Medicine |
| 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) | Drug given | J0129 |
7,400 | More often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 4
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 28 related providers in 4 groups
Other internists in Jackson 7
Same specialty, same city.
Trained at University of Mississippi School of Medicine 6
Other providers in the same specialty who trained at the same institution.
Class of 2013 at University of Mississippi School of Medicine 7
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in MS who bill this service to Medicare most often.
Common questions
What kind of doctor is Day S. Lennep?
Day S. Lennep is an internist in Jackson, MS. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
What is Day S. Lennep's address?
Day S. Lennep is listed at 2500 N State St, Jackson, MS 39216. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Day S. Lennep?
The number on file is (601) 984-5601. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Day S. Lennep?
Day S. Lennep's National Provider Identifier is 1538509955. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Day S. Lennep train?
Day S. Lennep attended University of Mississippi School of Medicine, graduating in 2013. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Day S. Lennep have?
Day S. Lennep has 13 years experience. Calculated from a graduation year of 2013, reported in the CMS National Downloadable File.
CMS public data
What procedures does Day S. Lennep perform?
According to Medicare billing data, Day S. Lennep performs procedures including insertion of needle into vein for collection of blood sample; reads or performs imaging such as x-ray of hand, 2 views; provides treatments such as administration of chemotherapy into vein, 1 hour or less and administration of chemotherapy into vein, each additional hour, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Day S. Lennep's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Day S. Lennep. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.