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Most Common Mental Health Diagnoses

July 29, 2019 BY Alanna Moriarty

Most Common Mental Health Diagnoses

Mental illness impacts millions of Americans every year. Despite the growing awareness of mental health issues, many patients face stigma and insecurity around their experiences and diagnoses.

According to the National Alliance of Mental Illness (NAMI), about 1 in 5 American adults experiences mental illness every year -- more than 46 million people. Roughly 1 in 25 American adults, or 11.2 million people annually, experiences mental illness that severely interferes with major life activities.

Definitive Healthcare tracked more than 12.7 million inpatient mental health diagnoses at hospitals in 2018. Below, we've listed the top 10 mental health diagnoses by total volume and by volume for primary diagnoses only.

Top 10 Mental Health Diagnoses (Primary and Secondary)

Rank ICD-10 Code ICD-10 Description Total Diagnoses

Avg. Charge per Claim

1.  F329 Major depressive disorder, single episode, unspecified 1,219,751 $2,817
2.  F419 Anxiety disorder, unspecified 1,174,335 $1,019
3.  F17210 Nicotine dependence, cigarettes, uncomplicated 1,047,672 $261
4.  F17200 Nicotine dependence, unspecified, uncomplicated 442,585 $219
5.  F0390 Unspecified dementia without behavioral disturbance 422,476 $3,125
6.  F332 Major depressive disorder, recurrent severe without psychotic features 382,329 $4,875
7.  F319 Bipolar disorder, unspecified 364,438 $4,805
8.  F1010 Alcohol abuse, uncomplicated 362,381 $1,532
9.  F411 Generalized anxiety disorder 323,854 $938
10.  F1020 Alcohol dependence, uncomplicated 269,772 $4,116

Fig 1 Data from Definitive Healthcare's platform of all-payor claims analytics, featuring primary and secondary inpatient diagnoses for hospitals. Claims intelligence is from calendar year 2018.

Of the top ten most-commonly diagnosed mental health issues, alcohol and nicotine dependence took four combined spots, and a total of 2.1 million diagnoses. Depressive and anxiety disorders each took two spots, with 1.6 million and nearly 1.5 million diagnoses, respectively. 

The most costly diagnosis is ICD-10 code F332, "Major depressive disorder, recurrent severe without psychotic features," with an average cost per claim of nearly $4,900. Least expensive by average episode cost is ICD-10 code F17200, "Nicotine dependence, unspecified, uncomplicated," at $219.

Top 10 Mental Health Diagnoses (Primary Only)

Rank ICD-10 Code ICD-10 Description Total Primary Diagnoses Avg. Charge per Claim
1.  F332 Major depressive disorder, recurrent severe without psychotic features 314,658 $4,875
2.  F329 Major depressive disorder, single episode, unspecified 183,451 $2,817
3.  F250 Schizoaffective disorder, bipolar type 130,369 $7,747
4.  F319 Bipolar disorder, unspecified 111,869 $4,805
5.  F209 Schizophrenia, unspecified 104,433 $5,688
6.  F10239 Alcohol dependence with withdrawal, unspecified 95,410 $8,548
7.  F29 Unspecified psychosis not due to a substance or known physiological condition 86,347 $3,400
8.  F331 Major depressive disorder, recurrent, moderate 85,870 $2,548
9.  F333 Major depressive disorder, recurrent, severe with psychotic symptoms 80,216 $6,187
10.  F1020 Alcohol dependence, uncomplicated 78,737 $4,116

Fig 2 Data from Definitive Healthcare's platform of all-payor claims analytics, featuring primary inpatient diagnoses for hospitals. Claims intelligence is from calendar year 2018.

The two most common mental health diagnoses by primary diagnosis only are "Major depressive disorder, recurrent severe without psychotic features" (ICD-10 code F332) and "Major depressive disorder, single episode, unspecified" (ICD-10 code F329). Though both of these appear in the list of most-common diagnoses when including both primary and secondary diagnoses, the latter ranks first when including secondary diagnoses. This indicates that a singe major depressive episode is more likely to be diagnosed in conjunction with another condition, which would likely be the reason for a patient's initial visit.

Like in the previous list, alcohol dependence takes two spots, one including withdrawal symptoms. The conditions have a combined 173,000 diagnoses. Schizophrenia and bipolar disorders take three of the top ten spots with 345,000 combined diagnoses. Unspecified psychosis also makes the list with 86,000 diagnoses. 

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