Eli Lilly and Company has been headquartered in Indianapolis since the day it was founded, and its corporate address is one of the simplest in American business: Lilly Corporate Center, Indianapolis, IN 46285. Below you will find everything you need to reach the company — the current corporate office address, the Lilly Support Services phone line patients and caregivers actually use, the Lilly Cares patient assistance number, the correct way to report a side effect, and the steps that work when you need to escalate a complaint beyond the front line.
| Headquarters | Lilly Corporate Center, Indianapolis, IN 46285, United States |
| Corporate office | Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285 (no patient services or walk-in support on site) |
| Corporate switchboard | 1-317-276-2000 (main office line — not a customer service line) |
| Lilly Support Services (patients and caregivers) | 1-800-545-5979 (1-800-LillyRx), Monday–Friday, 9 AM–5 PM ET for most medicines |
| Lilly Cares patient assistance | 1-800-545-6962, Monday–Friday, 8 AM–6 PM ET |
| Lilly Diabetes Solution Center (insulin) | 1-833-808-1234, Monday–Friday, 9 AM–5 PM ET |
Eli Lilly Headquarters Location and Contact Information
Eli Lilly and Company is headquartered at Lilly Corporate Center, Indianapolis, IN 46285. The address appears on the company’s own contact page and on the cover of its most recent quarterly report to the SEC, which lists Lilly Corporate Center as the principal executive office and 1-317-276-2000 as the registrant’s telephone number. The campus sits just south of downtown Indianapolis, on the site the company has occupied in one form or another since the 1870s — unlike many large corporations, Lilly has never moved its headquarters out of its home city.
Keep in mind that the corporate center is an executive and research campus, not a customer service location. There is no walk-in patient help desk, no pharmacy, and no way to pick up or return medicine there. The switchboard number connects to the corporate office, not to a support team, so patients and caregivers should use the dedicated lines on the company’s contact page instead.
Phone Contacts
Lilly routes nearly every patient and prescriber question through one toll-free number, 1-800-LillyRx, with hours that vary by medicine. These numbers come from the company’s official contact page and the Lilly Cares Foundation site:
- Lilly Support Services (all patient and caregiver questions): 1-800-545-5979 (1-800-LillyRx)
- Mounjaro, Zepbound, Trulicity, Emgality, Forteo: 1-800-LillyRx — Monday–Friday, 9 AM–5 PM ET
- Oncology medicines (Verzenio, Cyramza, Erbitux, Jaypirca, Retevmo) and Taltz, Olumiant, Omvoh, Ebglyss: 1-800-LillyRx — Monday–Friday, 8 AM–10 PM ET
- Kisunla (Alzheimer’s): 1-800-LillyRx — Monday–Friday, 9 AM–6 PM ET
- Insulin affordability (Lilly Diabetes Solution Center): 1-833-808-1234 — Monday–Friday, 9 AM–5 PM ET
- Lilly Cares Foundation (free medicine for qualifying patients): 1-800-545-6962 — Monday–Friday, 8 AM–6 PM ET
- Health care professionals (medical information): 1-800-545-5979, or chat online at medical.lilly.com
- Ethics and Compliance Hotline: 1-800-815-2481
- Corporate switchboard (not customer service): 1-317-276-2000
Customer Service and Support Channels
Phone is not the only way in. Patients and caregivers can submit a question through the electronic form on Lilly’s contact page, and health care professionals can search medical information or chat with a Lilly medical professional at medical.lilly.com. Lilly Support Services also handles access and affordability questions — savings programs, benefits verification, and prior-authorization help for specific medicines — and the company’s LillyDirect platform, launched in 2024, connects U.S. patients with independent telehealth providers and home delivery of certain Lilly medicines.
If you are experiencing a side effect or a problem with a device or pen, do not call to follow up: Lilly asks that you use its online side effect and product concern tool, which issues a confirmation and routes quality complaints for follow-up within 3–5 business days when needed. On social media, the company’s official X account is @elilillyandco, but it is a public channel — never post health details or prescription information there. One practical tip: every Lilly support line runs weekdays only, so call soon after the 9 AM ET opening with your prescription label, lot number, and prescriber’s name at hand.
Mailing Addresses for Correspondence and Patient Assistance
Lilly does not publish separate payment or claims addresses the way a bank or insurer would, but it does publish a handful of official mailing addresses that matter for specific requests. Note that Lilly Cares, the company’s patient assistance program, is a separate nonprofit foundation with its own P.O. box in San Diego — applications sent to the Indianapolis headquarters will be delayed.
| Corporate headquarters (general correspondence) | Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285 |
| Shareholder requests (paper copies of SEC reports) | Eli Lilly and Company, c/o General Counsel and Secretary, Lilly Corporate Center, Indianapolis, IN 46285 |
| Lilly Cares Foundation applications | Lilly Cares, P.O. Box 501847, San Diego, CA 92150 (fax 1-844-431-6650) |
| Media and b-roll requests | [email protected], or the media request form at lilly.com/news/media |
Company Background
Colonel Eli Lilly, a Civil War veteran and pharmaceutical chemist, opened his laboratory in Indianapolis on May 10, 1876. The company he founded made its name in 1923 with Iletin, the world’s first commercially available insulin, and followed it with a string of firsts: the first mass-produced penicillin in the 1940s, the first global distribution of the Salk polio vaccine in 1955, and Humulin in 1982, the first human health care product made with recombinant DNA. Prozac (1986), Zyprexa (1996), and Cymbalta (2004) carried the company through the following decades, according to Lilly’s key facts and history pages.
The modern chapter is defined by incretin medicines. Mounjaro (tirzepatide) launched for type 2 diabetes in 2022, Zepbound followed for chronic weight management in 2023, and Kisunla, Lilly’s first Alzheimer’s treatment, arrived in 2024. The result has been extraordinary growth: Lilly reported $65.2 billion in revenue for 2025, up 45% from the prior year, and raised its 2026 outlook to $85–87 billion after second-quarter sales rose 48%. The company trades on the New York Stock Exchange under the ticker LLY and employed 51,168 people worldwide as of June 30, 2026, including 13,583 in Indianapolis. Its products are sold in roughly 90 countries and made in plants across 10 of them.
Leadership
David A. Ricks has served as Chair, President, and Chief Executive Officer since 2017, after roughly two decades in Lilly leadership roles, including president of Lilly Bio-Medicines. Unusually for a company of its size, Eli Lilly and Company is incorporated in its home state of Indiana rather than Delaware — the cover of its latest Form 10-Q lists Indiana as the state of incorporation. You can look up the registered entity through the state registry; our Indiana business search guide explains how.
Key Office Locations
Indianapolis is both the executive headquarters and the company’s largest research and manufacturing hub, with more than 14,500 employees across the city and the rest of Indiana. Lilly’s annual report lists major U.S. production sites in Indiana, North Carolina, Puerto Rico, and Wisconsin, and the company has committed more than $20 billion since 2020 to new and expanded Indiana plants, including a large manufacturing campus under construction in Lebanon, northwest of Indianapolis. Overseas, major production sites operate in Ireland, France, Spain, Italy, China, and Japan. Research and development is concentrated in owned facilities in Indiana plus leased laboratories in California, Massachusetts, Colorado, and New York, including the Lilly Gateway Labs network for biotech start-ups that began in San Francisco in 2019.
Dealing with Customer Complaints
Start with the standard channels: call Lilly Support Services at 1-800-545-5979 or submit the online question form, and keep a record of the date, the representative’s name, and any reference number. Quality problems with a pen, vial, or device should go through the online product concern tool rather than the phone line, since that is the route Lilly logs and investigates. If the front line cannot resolve the issue, put the complaint in writing to the corporate office at Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285 — written complaints to headquarters are routed to the appropriate department.
Because Lilly makes prescription medicines, you also have a regulator most companies’ customers do not: any side effect or product defect can be reported directly to the U.S. Food and Drug Administration through FDA MedWatch or by calling 1-800-FDA-1088 — Lilly’s own reporting page points patients to this option. For billing, marketing, or pricing disputes that are not safety-related, file with the Federal Trade Commission or your state attorney general’s consumer protection office. Legal action remains an option of last resort for unresolved disputes.
Summary
Eli Lilly’s headquarters is Lilly Corporate Center, Indianapolis, IN 46285, though almost everything a patient needs happens through other channels: 1-800-545-5979 (1-800-LillyRx) for Lilly Support Services on weekdays, 1-800-545-6962 for Lilly Cares patient assistance, the online tool for side effects and product concerns, and the FDA when escalation is needed. Looking for another company’s corporate contacts? Browse our other headquarters guides.
Frequently Asked Questions
Where is Eli Lilly’s headquarters located?
Eli Lilly and Company is headquartered at Lilly Corporate Center, Indianapolis, IN 46285, United States. The company has been based in Indianapolis since its founding in 1876.
What is Eli Lilly’s customer service phone number?
Patients, caregivers, and health care professionals call Lilly Support Services at 1-800-545-5979 (1-800-LillyRx). Lines are open Monday through Friday; hours are 9 AM–5 PM ET for most medicines and 8 AM–10 PM ET for oncology and several immunology products.
Who is the CEO of Eli Lilly?
David A. Ricks is Chair, President, and Chief Executive Officer of Eli Lilly and Company. He has led the company since 2017.
Who owns Eli Lilly?
Eli Lilly and Company is a publicly traded corporation listed on the New York Stock Exchange under the ticker LLY, so it is owned by its shareholders. It is incorporated in Indiana.
How do I contact the Eli Lilly corporate office?
Write to Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285, or call the corporate switchboard at 1-317-276-2000. The switchboard is not a patient support line — use 1-800-545-5979 for questions about a medicine.
How do I report a side effect from a Lilly medicine?
Use the online reporting tool at lilly.com/medicines/report-product-concern, or report directly to the FDA at fda.gov/medwatch or 1-800-FDA-1088. Seek medical advice from your doctor first if you are experiencing a side effect.
How do I get free Lilly medicine if I cannot afford it?
The Lilly Cares Foundation provides prescribed Lilly medications at no cost for up to 12 months to qualifying U.S. patients with financial need. Call 1-800-545-6962 (Monday–Friday, 8 AM–6 PM ET) or apply at lillycares.com.