San Mateo Medicaid payments for National Codes Established for State Medicaid Agencies reach $22,848,369 in 2024

In 2024, Medicaid providers in San Mateo billed $22,848,369 for services in the National Codes Established for State Medicaid Agencies category, data from the U.S. Department of Health and Human Services Medicaid Provider Spending database shows. This total represents an 11% rise compared with 2023, when providers submitted $20,588,712 in claims for the same category.

Medicaid is a state-run public health insurance program, funded jointly by federal and state governments. The program covers low-income people and families, seniors, children and individuals with disabilities, and represents a major segment of the U.S. health care system.

Since Medicaid payments are sourced from taxpayers, shifts in local billing reflect how public health care funds are distributed within the community.

The “National Codes Established for State Medicaid Agencies” category encompasses Medicaid-billed services grouped by care type, based on standardized HCPCS and CPT code sets. Each billing code in this analysis was attributed to a single service group using standardized prefixes and numbering, allowing tracking of related services without duplication and maintaining clear historical comparisons.

While total Medicaid payments rose in several categories, in 2024, National Codes Established for State Medicaid Agencies ranked first in San Mateo for total payments.

Statewide in California, this category also held the top spot by Medicaid payment amount in 2024.

Between 2019 and 2024, Medicaid payments in San Mateo tied to the National Codes Established for State Medicaid Agencies rose by $12,215,358, or 114.9%. Certain periods, including 2023 and 2021, saw especially significant year-on-year growth.

Spending in this category, though citywide, was primarily concentrated in a few ZIP codes. For 2024, ZIP code 94403 led with $19,551,098, followed by 94402 at $2,853,194, and 94401 reporting $444,076. Together, these 3 ZIP codes made up 100% of all Medicaid payments for this category in San Mateo during the year.

A small number of billing codes accounted for much of the Medicaid spend within the National Codes Established for State Medicaid Agencies category.

From 2023 to 2024, Medicaid payments for this category in San Mateo grew 11%, compared with an 8.7% increase across all Medicaid claim categories in the city for the same period.

According to the Centers for Medicare & Medicaid Services, combined federal and state Medicaid expenditures reached roughly $871.7 billion in fiscal 2023, making up approximately 18% of national health spending—a significant jump from about $613.5 billion in 2019, before the COVID-19 pandemic began.

This increase reflects nearly 40% growth in Medicaid outlays over a few years, largely attributed to expanded enrollment and increased service use during and after the pandemic.

Recent federal budget measures enacted under the Trump administration included key proposals to cut federal Medicaid funding and restructure the program. The “One Big Beautiful Bill Act,” signed into law in 2025, is expected to reduce federal Medicaid spending by over $1 trillion over 10 years, and features policies such as work requirements and increased cost-sharing that may reduce both coverage and funding for certain beneficiaries. As a result, states could take on more financial responsibility, and overall federal support for Medicaid may slow, even as the program continues providing coverage to millions.

Note: HCPCS codes are listed to provide additional context. The totals and rankings in this article are based on these standardized service groupings, not individual billing codes.

Data in this report is drawn from the U.S. Department of Health and Human Services Medicaid Provider Spending database. Full source data is available here.