AATHI LAKSHMI MARIAPPAN
NPI 1023635224
Internal Medicine in Oak Ridge, TN

Q: What is Aathi Lakshmi Mariappan's NPI number?

The NPI number for Aathi Lakshmi Mariappan is 1023635224. It was assigned to this individual provider in the NPPES registry on July 3, 2020.

Q: What is Aathi Lakshmi Mariappan's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since July 03, 2020PECOS EnrolledAccepts Medicare Assignment

990 OAK RIDGE TPKE, OAK RIDGE, TN 37830(865) 835-1000(865) 835-4303 Get Directions Write a Review

NPPES record last updated: July 8, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 8, 2025, Jul 3, 2020 (2 updates tracked since 2020).

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About Aathi Lakshmi Mariappan NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

AATHI LAKSHMI MARIAPPAN (NPI 1023635224) is an individual internal medicine provider in Oak Ridge, Tennessee, licensed in Tennessee (68290) and active in the NPI registry since July 2020. She is enrolled in Medicare PECOS, is affiliated with Roane Medical Center, and is a graduate of Other (2018).

NPPES Registry Identity

NPI1023635224

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameAATHI LAKSHMI MARIAPPAN

Location Address990 OAK RIDGE TPKEOak Ridge, TN 37830-6976

Mailing Address990 Oak Ridge TpkeOak Ridge, TN 37830-6976 · (865) 835-4304 · Fax (865) 835-4303

Phone(865) 835-1000

Fax(865) 835-4303

Sole ProprietorNo

Medical School CMSOtherGraduated 2018

Enumeration DateJuly 3, 2020

Last NPPES UpdateJuly 8, 20252 updates tracked since enumeration

NPPES CertifiedJuly 8, 2025

✔ NPI 1023635224 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in TN · 68290

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

990 OAK RIDGE TPKE, Oak Ridge, TN 37830

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Aathi Lakshmi Mariappan is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4789030628

PECOS Enrollment IDI20231027002803

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Aathi Lakshmi Mariappan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Hospital Medicine Services Of Tennessee PC

216 mi

Hospitalist

600 WILSON CREEK RD
Lawrenceburg, IN 47025

Reassigned Medicare billing, Tennessee enrollment
394 clinicians in this Medicare group

NPI 1528433802 (812) 537-1010

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

292 services132 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

262 services119 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

137 services131 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

73 services73 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Roane Medical Center

Acute Care Hospitals · Harriman, TN

5/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number440031

Location8045 Roane Medical Center DriveHarriman, TN 37748 · Roane County

Emergency services

Methodist Medical Center Of Oak Ridge

Acute Care Hospitals · Oak Ridge, TN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440034

Location990 Oak Ridge Turnpike Box 529Oak Ridge, TN 37830 · Anderson County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37830 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$121.80 typical visit price

range $52.64 – $160.89

Typical copayment $30.45 (range $13.16 – $40.22)

Most-billed visit code 99204

Established Patient

$93.60 typical visit price

range $16.72 – $131.41

Typical copayment $23.40 (range $4.18 – $32.85)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. LAUREN WALRAVEN HOWELL R.D.

Dietitian, Registered

990 OAK RIDGE TPKE, FOOD AND NUTRITION SERVICES
OAK RIDGE, TN 37830

Anderson County (865) 835-4109

CHUKWUMA UMUNAKWE M.D.

Emergency Medicine