Using MSIS Data to Analyze Medicaid Eligibility and Managed Care Enrollment Patterns in 1999. TABLES 4A-4C: Medicaid Managed Care Enrollment by Plan Type Combination and Month in 1999

02/01/2003

Table 4A presents an unduplicated count of Medicaid managed care enrollment nationwide, showing, for each month, the number of Medicaid enrollees in only one type of managed care plan as well as the number in more than one type of plan. Table 4B converts the data in Table 4A to a percent distribution by month. The last column of the tables presents average monthly data.

Table 4C provides state-by-state information, showing monthly Medicaid enrollment by plan type combination for each state during December 1999. This table indicates the extent to which individual states were using various types of managed care, including combinations with more than one plan.

This information on Medicaid managed care is completely new and confirms that a sizeable proportion of Medicaid eligibles participated in more than one type of managed care plan during 1999.

Findings

  • In every month of 1999, about 55 percent of Medicaid beneficiaries were enrolled in some type of managed care. Just over 37 percent were enrolled in only one type of managed care plan, while 18 percent were enrolled in more than one type of plan. The two most frequent combinations were HMO/dental and HMO/BHP. Enrollment patterns changed little from month to month over the year.

  • On average and in every month, 20 percent of beneficiaries were enrolled only in an HMO, 8 percent only in a PCCM, 6 percent only in a dental plan, 8 percent in an HMO and dental combination, and 6 percent in an HMO and BHP plan combination. An additional 1.7 percent were enrolled in a PCCM/BHP combination, while 1.4 percent were enrolled solely in a BHP. Enrollment in other single or combination plan types was less than 4 percent.

  • As depicted in Table 4C, the December MSIS data show that two states accounted for most of the enrollment in more than one managed care plan. California's Medicaid program accounted for almost all the enrollees in the HMO/dental plan combination. Of the 2.6 million enrollees in the HMO/dental combination in December 1999, 2.5 million were from California. Similarly, Tennessee's Medicaid program accounted for about two-thirds of the enrollment in the HMO/BHP combination (1.3 of the 2.1 million enrollees in the HMO/BHP combination).

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