Members and guests

Imperial Insurance Companies, Inc. (HMO) (HMO SNP) is a Medicare Advantage Prescription Drug Plan for people living in specific zip codes in Bexar, Collin, Comal, Dallas, Denton, El Paso, Harris, Hays, Tarrant, Travis, Williamson.

To join any of our Plan Benefit Packages (PBP)s, you must meet all of the following Requirements:

  • You live in our service area
  • You have both Medicare Part A and Medicare part B
  • You are a United States Citizen
  • You do not have End-Stage Renal Disease (ESRD), with limited exceptions

If you’re enrolled in a Medicare plan or enrolling for the first time, generally you can only enroll, switch plans, or disenroll from a plan during certain times of the year. 

Annual Election Period (AEP)

AEP is from October 15 through December 7 of every year. MA eligible individuals may enroll in or disenroll from an MA plan. The last enrollment request made, determined by the application date, will be the enrollment request that takes effect. 

Initial Coverage Election Period (ICEP)

The ICEP is the period during which an individual newly eligible for MA may make an initial enrollment request to enroll in an MA plan. This period begins three months immediately before the individual’s first entitlement to both Medicare Part A and Part B and ends on the later of: 

  1. The last day of the month preceding entitlement to both Part A and Part B, or; 
  2. The last day of the individual’s Part B initial enrollment period. 

Initial Enrollment Period for Part D (IEP for Part D) 

The Initial Enrollment Period for Part D (IEP for Part D) is the period during which an individual is first eligible to enroll in a Part D plan. In general, an individual is eligible to enroll in a Part D plan when he or she is entitled to Part A OR is enrolled in Part B, AND permanently resides in the service area of a Part D plan. Ultimately, CMS provides a part D eligibility effective date and maintains it in CMS systems.

Open Enrollment Period for Institutionalized Individuals (OEPI)

The OEPI is continuous for eligible individuals. For purposes of enrollment under the OEPI election period, an institutionalized individual is defined as an individual who moves into, resides in, or moves out of an institution. The OEPI ends two months after the month the individual moves out of the institution.

Special Election Periods (SEP)

Special election periods constitute periods outside of the usual IEP, AEP or MA OEP when an individual may elect a plan or change his or her current plan election. As detailed below, there are various types of SEPs, including SEPs for dual eligibles, and for individuals whose current plan terminates, who change residence and who meet “exceptional conditions”.

Medicare Advantage Open Enrollment Period (MA OEP)

During the MA OEP, MA plan enrollees may enroll in another MA plan or disenroll from their MA plan and return to Original Medicare. Individuals may make only one election during the MA OEP. 
Individuals may add or drop Part D coverage during the MA OEP. Individuals enrolled in either MA-PD or MA-only plans can switch to:

• MA-PD 
• MA-only 
• Original Medicare (with or without a stand-alone Part D plan) 

The effective date for an MA OEP election is the first of the month following receipt of the enrollment request.

To join Imperial Health Insurance Value (HMO C-SNP) you must have been diagnosed with Diabetes, Chronic Heart Failure (CHF), and/or Cardiovascular Disorder(s).

To join Imperial Health Insurance Dual (HMO D-SNP) you must have both Medicare and Medicaid.

Anyone meeting the above qualifications are eligible to join. Once enrolled, members must receive all care from plan providers, except in the case of emergency or urgent care. If you obtain routine care from out-of-network providers, neither Medicare nor Imperial Insurance Companies, Inc. (HMO) (HMO SNP) will be responsible for the costs.

As a member if you have any question please call us at 1-800-838-8271 for English and Spanish and 1-800-708-5976 for Chinese.

Prospective Members

If you are interested in enrolling into Imperial Insurance Companies, Inc. you may do so in one of the following ways:

  1. Call us to enroll telephonically. Call 1-800-838-5648 and we will take your enrollment information over the phone.
  2. Call us to schedule a face-to-face appointment. Please call 1-800-838-5914 and we can schedule an appointment with an employed Sales Representative or Independent Agent.

And if you do not wish to make an appointment with one of our sales representatives, you may

  1. Download the attached enrollment form and submit it by fax 626-380-9066, Enrollment Form – [PDF, 801KB]
  2. Download the attached enrollment form and submit if by email
  3. Mail it to us at:

Imperial Insurance Companies, Inc.
Attn: Enrollment Department
PO BOX 60874
Pasadena, CA 91116

  1. On-line enrollment. Medicare beneficiaries may also enroll in Imperial Insurance Companies, Inc. through the CMS Medicare Online Enrollment Center located at

By accessing these links, you acknowledge that you have reviewed the Imperial Insurance Companies, Inc.  Summary of BenefitsDrug Formulary, and the Provider Search Function which are all provided within this website or by calling the Enrollment Department.

Quality Assurance Programs

Quality Assurance programs at Imperial Insurance Companies, Inc. address real-time review of medical operations and claims data to ensure our members are receiving safe and appropriate services. The focus of the program is on the medical needs of our members and services required in order to optimize one’s ability to function at the highest level of capacity. The program encompasses services provided by PCP’s, Specialists, Vendors, and Prescription Drugs. Should you have specific questions regarding the program, please contact us at 1-800-838-8271 TTY/TDD users should call 711 for additional information.

To read PDFs, you will need Adobe Acrobat Reader. You can download here.
To find out more about Imperial Health Plan of California (HMO) - (HMO SNP), including plan benefits, provider lookup or view member materials, click below.
If you would like to access Imperial Health Holdings Medical Group, click below or call direct at (626) 838-5100 or toll-free at (800) 497-5509