Stata MEPS Data Merging
Introduction to MEPS
Understanding Healthcare in the US
How do we know how much healthcare costs in the United States? Or who has insurance, and what kind? Researchers and policymakers get answers to these questions from a major national survey called the Medical Expenditure Panel Survey, or MEPS.
Conducted by the Agency for Healthcare Research and Quality (AHRQ), MEPS is the most complete source of data on the cost and use of health care and health insurance coverage in the US. Its main purpose is to provide a detailed, person-level picture of how Americans use and pay for medical care.
The Three Parts of MEPS
MEPS isn't just one survey. It's a set of three interconnected surveys that work together to create a comprehensive dataset. Each component gathers a different piece of the puzzle.
1. Household Component (HC) This is the foundation of MEPS. It's a large-scale survey of families and individuals drawn from a nationally representative sample. Interviewers contact the same households multiple times over a two-year period to collect detailed information about their health status, insurance coverage, medical conditions, and any doctor visits, hospital stays, or prescriptions they've had.
The Household Component provides the patient's perspective on their healthcare journey.
2. Medical Provider Component (MPC) To ensure financial data is as accurate as possible, MEPS follows up on the information gathered from households. The MPC contacts the hospitals, doctors, and pharmacies that were mentioned by the HC participants. With the participant's permission, this component collects exact data on costs, charges, and payments for the services they received.
3. Insurance Component (IC) The IC gathers data on employer-sponsored health insurance. It surveys a sample of private and public sector employers about the health insurance plans they offer to their employees. This includes information about the number and types of plans, premiums, employee contributions, and eligibility requirements.
A Wealth of Information
By combining these components, MEPS provides an incredibly rich dataset. Researchers can explore a wide range of topics. The data includes:
| Data Category | Examples |
|---|---|
| Demographics | Age, sex, race, ethnicity, marital status, education, income |
| Health Conditions | Specific medical conditions, perceived health status, functional limitations |
| Medical Events | Doctor visits, emergency room use, hospital stays, dental visits, home health care |
| Expenditures | How much was paid for services, and who paid (insurance, individual, government) |
| Insurance Coverage | Type of insurance (private, Medicare, Medicaid), coverage details, premiums |
| Prescribed Drugs | Specific medications used, costs, and payment sources |
Accessing MEPS Data
AHRQ makes MEPS data available for public use, though there are a couple of different ways to access it, depending on the level of detail you need.
Public-Use Files (PUFs) These are datasets that are available for anyone to download for free from the MEPS website. To protect the privacy of survey participants, all personal identifiers like names and addresses are removed. Some other variables might be simplified or grouped into broader categories to prevent anyone from being identified. For most research questions, these files are more than sufficient.
Restricted-Use Files For researchers who need more detailed information, such as more specific geographic locations or finer income categories, AHRQ provides restricted-use files. Accessing this data is a more involved process. Researchers must submit an application explaining why they need the sensitive data, agree to strict confidentiality rules, and can only access the files through a secure Federal Statistical Research Data Center.
These survey design and estimation complexities require special consideration when analyzing MEPS data (i.e., it is not appropriate to assume simple random sampling).
Along with the data files, the MEPS website offers extensive documentation. You can find survey questionnaires, codebooks that explain each variable, and detailed methodology reports. These resources are essential for understanding how the data was collected and how to use it correctly.
Ready to test your knowledge? This quiz will cover the key aspects of the MEPS survey.
What is the primary purpose of the Medical Expenditure Panel Survey (MEPS)?
Which MEPS component is specifically designed to collect data from employers about the health insurance they offer?
Understanding the structure and purpose of MEPS is the first step for anyone looking to research healthcare trends in the United States.