Ambalavanan Arunachalam, M.D
NPI 1073868154ActiveIndividual· Internal Medicine, Pulmonary Disease· Chicago, IL
Internal Medicine, Pulmonary Disease (M.D) with Northwestern Medical Faculty Foundation and 2 other groups, practicing in Chicago, Illinois. Their prescriptions cost Medicare Part D more than their services did: $880,321 for 1,587 claims, against $64,383 paid for services in 2024. United Therapeutics Corporation was the largest of 8 companies reporting payments in 2025, $870.93 in all, mostly food and beverage. Lists Dekalb Regional Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1073868154 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D |
| Sole proprietor | No |
| NPI issued | Jul 16, 2012 |
| Last updated in NPPES | May 16, 2022 |
| Certified by provider | May 16, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | 036152826 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (AL); Practitioner - Pulmonary Disease (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 109 |
|---|---|
| Services billed | 584 across 21 procedure codes |
| Paid by Medicare | $64,383 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,587 · 2,884 30-day fills |
|---|---|
| Patients | 128 |
| Total drug cost | $880,321 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Critical Care (Intensivists), Pulmonary Disease |
| Telehealth | Offers telehealth |
Medical groups
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 clinicians
- Central Dupage Physician GroupGeneva, IL · 1,080 clinicians
- Synergy Hospitalist Partners LLCFort Payne, AL · 5 clinicians
Hospital affiliations
- Dekalb Regional Medical CenterFort Payne, AL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine McHenryMcHenry, IL
- Northwestern Memorial HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
Industry payments (Open Payments)
- 2025$870.93 · 18 payments from 8 companies
- 2024$535.31 · 12 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| United Therapeutics Corporation | $195.50 | 2 |
| Paragonix Technologies, Inc. | $184.39 | 2 |
| Alexion Pharmaceuticals, Inc. | $175.00 | 1 |
| Abbvie Inc. | $134.79 | 6 |
| Melinta Therapeutics, LLC | $103.34 | 4 |
What the 2025 payments were for
- Food and Beverage$695.93 · 17 payments
- Consulting Fee$175.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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