This page compares two distinct NUCC-taxonomy specialties tracked by the CMS National Plan and Provider Enumeration System: Chronically Ill Psychiatric/Mental Health Clinical Nurse Specialist, which currently counts 4 enrolled providers across 3 U.S. states and territories, and Clinical Nurse Specialist, with 1,715 providers across 49 states. Each clinician on these rosters selected a primary NUCC code at NPI enrollment, so the totals measure how many providers self-identify their primary practice as Chronically Ill Psychiatric/Mental Health Clinical Nurse Specialist or Clinical Nurse Specialist rather than the total population ever trained or credentialed in either field — dual-certified clinicians show up under whichever code they registered first.

On national volume, Clinical Nurse Specialist carries the larger provider roster (1,715 vs 4), and Clinical Nurse Specialist has the wider geographic footprint at 49 states versus 3. The top Chronically Ill Psychiatric/Mental Health Clinical Nurse Specialist concentration sits in Washington (2 providers), while Clinical Nurse Specialist peaks in Ohio (234). The per-capita columns in the table below normalize each state's raw count against 2023 Census population estimates, which matters because absolute provider counts track population scale first and specialty density second — a small state with a strong training pipeline can out-rank a larger state on per-100K availability.

Use this comparison to understand relative availability, not to judge clinical substitutability — Chronically Ill Psychiatric/Mental Health Clinical Nurse Specialist and Clinical Nurse Specialist are distinct specialties with different scopes of practice, training requirements, and conditions they treat, even when their NUCC categories overlap. Important: PlainDoctor is a directory of publicly available CMS government data, not medical advice, a provider rating, or a recommendation about which specialty a patient should consult. Always work with a licensed clinician to determine which specialty is appropriate for your condition, verify any specific provider through the NPPES NPI Registry and the relevant state medical board, and consult the NUCC taxonomy documentation for the formal scope-of-practice definitions behind each specialty code.