Mike O'Callaghan Military Medical Center - Nellis Air Force Base

01/22/2026

Updates from our Referral Management Center. Thank you for your patience as our team works to support your healthcare needs.

01/15/2026

‼ Reminder ‼

Outpatient services, including the Appointment Line, and Laboratory will be closed for Martin Luther King Jr Day Monday, January 19, 2026.

Inpatient operations and the Emergency Department remain open 24/7/365.

The MHS Nurse Advice Line is also available 24/7 to TRICARE beneficiaries for health-related questions and guidance. You can reach the Nurse Advice Line by calling 800-TRICARE (874-2273) or visiting MHSNurseAdviceLine.com

To view all our scheduled closures, visit: http://nellis.tricare.mil/Getting-Care/Scheduled-Closures

The official website for Mike O'Callaghan Military Medical Center at Nellis Air Force Base

01/12/2026

There is no time like the present! 💪 Read about how our medics are leaning into medical readiness ⤵

Cannon blasts echoed across the desert and a helicopter hovered overhead as the cries of casualties cut through the air. This scenario was no ordinary training day; it was the inaugural Medic Rodeo at

12/29/2025

‼ Reminder ‼

Outpatient services, including the Appointment Line, Main Pharmacy, and Laboratory will be closed for the New Year Thursday, January 1 and Friday, January 2.

The Satellite Pharmacy will be open with reduced staffing on Friday, January 2.

Inpatient operations and the Emergency Department remain open 24/7/365.

The MHS Nurse Advice Line is also available 24/7 to TRICARE beneficiaries for health-related questions and guidance. You can reach the Nurse Advice Line by calling 800-TRICARE (874-2273) or visiting MHSNurseAdviceLine.com

To view all our scheduled closures, visit: http://nellis.tricare.mil/Getting-Care/Scheduled-Closures

The official website for Mike O'Callaghan Military Medical Center at Nellis Air Force Base

12/22/2025

‼ Reminder ‼

Outpatient services, including the Appointment Line, and Laboratory will be closed for the Christmas Holiday Wednesday, December 24 thru Friday, December 26.**

**𝐓𝐡𝐞 𝐒𝐚𝐭𝐞𝐥𝐥𝐢𝐭𝐞 𝐏𝐡𝐚𝐫𝐦𝐚𝐜𝐲 𝐰𝐢𝐥𝐥 𝐛𝐞 𝐨𝐩𝐞𝐧 𝐟𝐫𝐨𝐦 𝟖 𝐚.𝐦. 𝐭𝐨 𝐧𝐨𝐨𝐧 𝐨𝐧 𝐅𝐫𝐢𝐝𝐚𝐲, 𝐃𝐞𝐜𝐞𝐦𝐛𝐞𝐫 𝟐𝟔.

Inpatient operations and the Emergency Department remain open 24/7/365.

The MHS Nurse Advice Line is also available 24/7 to TRICARE beneficiaries for health-related questions and guidance. You can reach the Nurse Advice Line by calling 800-TRICARE (874-2273) or visiting MHSNurseAdviceLine.com
To view all our scheduled closures, visit: http://nellis.tricare.mil/Getting-Care/Scheduled-Closures

The official website for Mike O'Callaghan Military Medical Center at Nellis Air Force Base

12/18/2025

Did you know? You are able to access services for some non-emergent medical needs at your assigned primary care clinic without an appointment. Visit http://nellis.tricare.mil/Getting-Care/Walk-in-Services for more information!

12/12/2025

Did you know that you can get virtual mental health services with TRICARE? These options are a great way to get care when you can’t visit a provider’s office in person.

Did you know that you can get virtual mental health services with TRICARE? These options are a great way to get care when you can’t visit a provider’s office in person. Virtual mental health visits

12/10/2025

‼ Service announcement for Friday, December 12, 2025 ‼

The 99 ABW has designated Friday, December 12, 2025 as a down day for 99 ABW personnel.

Outpatient clinics remain open to scheduled appointments. The Satellite Pharmacy will remain open with reduced staffing. The Main Pharmacy and the Laboratory are closed.

Inpatient operations and the Emergency Department remain open 24/7/365. The MHS Nurse Advice Line is also available 24/7 to TRICARE beneficiaries for health-related questions and guidance. You can reach the Nurse Advice Line by calling 800-TRICARE (874-2273) or visiting MHSNurseAdviceLine.com

To view all our scheduled closures, visit: http://nellis.tricare.mil/Getting-Care/Scheduled-Closuresnts

The official website for Mike O'Callaghan Military Medical Center at Nellis Air Force Base

12/09/2025

‼ Reminder ‼ TRICARE Open Season ends TODAY!

Outside of a qualifying life event, this is your last chance to enroll or change health plans for 2026.

Learn more at: tricare.mil/openseason

12/04/2025

Mike O'Callaghan Military Medical Center earned an 'A' Safety Grade in an assessment from the Leapfrog Group! Learn more about this achievement here:

Mike O’Callaghan Military Medical Center (MOMMC) has received an “A” Leapfrog Hospital Safety Grade for Fall 2025, demonstrating a commitment to providing high-quality care to all patients.

12/04/2025

TRICARE Open Season ends next week. Now is the time to take a look at your options for 2026. Have you considered enrolling in a TRICARE Prime plan?

12/03/2025

Do you know what to do when you or a family member feels sick, but it’s outside of business hours or it’s the weekend? Should you go to an urgent care clinic or the emergency room, or wait until your doctor’s office is open?

The MHS Nurse Advice Line is a free, 24/7 service for TRICARE beneficiaries to get health advice and information from registered nurses.

Call 800-TRICARE or visit MHSNurseAdviceLine.com