Analysis
NAICS 6215 is the 2022 industry group for medical and diagnostic laboratories, part of 621 (Ambulatory Health Care Services).
It has only one more detailed code, 62151, which covers exactly the same activities; the definition, index entries and statistics are on that page.
Between 2018 and 2023 the number of establishments grew 30% and employment rose 14%. The 2018 count used NAICS 2017, so part of a large move can come from codes being redefined rather than from businesses opening or closing.
County Business Patterns counts 23,603 US establishments in this code in 2023, employing 332,060 people at an average annual payroll of $74,389 per employee (61st percentile of national industries). 63% of the establishments have fewer than five employees, which marks it as a small-business industry.
By establishments it ranks 6th of the 7 codes at this level within Ambulatory Health Care Services, with 3.4% of them.