Billing Codes for Incomplete ADHD Evaluation
When evaluating a child for ADHD without reaching a definitive diagnosis, use symptom-based ICD-10 codes (R41.840 for attention deficit, R46.81 for hyperactivity, or R46.89 for other behavioral symptoms) paired with the appropriate CPT evaluation and management (E/M) code based on visit complexity.
ICD-10 Coding Strategy
Primary Symptom Codes
When DSM-5 criteria are not yet met or the evaluation is incomplete, code the presenting symptoms rather than ADHD itself:
- R41.840 - Attention and concentration deficit
- R46.81 - Obsessive-compulsiveness (includes hyperactivity)
- R46.89 - Other symptoms and signs involving appearance and behavior
- R41.843 - Memory deficit (if relevant)
Problem-Level Considerations
The 2019 AAP guideline acknowledges that children often present with "behaviors relating to activity level, impulsivity, and inattention but who do not fully meet DSM-5 criteria" 1. In these cases, symptom codes are appropriate while the diagnostic evaluation continues.
Alternative Approach: "Unspecified" ADHD Code
If you have strong clinical suspicion but need more information to specify the presentation type, consider:
- F90.9 - Attention-deficit hyperactivity disorder, unspecified
However, this technically requires meeting DSM-5 criteria for ADHD, just without determining the specific presentation (inattentive, hyperactive-impulsive, or combined) 1.
CPT Code Selection
Evaluation and Management Codes
Bill the appropriate office visit E/M code based on:
- 99202-99205 (new patient) or 99212-99215 (established patient)
- Code level determined by medical decision-making complexity and time
Considerations for Code Level
The evaluation complexity typically justifies higher-level codes because:
- Multiple data sources required (parent reports, teacher ratings, behavioral scales) 1
- Screening for comorbid conditions is recommended (anxiety, depression, learning disabilities, sleep disorders) 1
- Differential diagnosis considerations (ruling out mimicking conditions)
- Coordination with schools and other observers
Clinical Pitfalls to Avoid
Don't Prematurely Assign ADHD Diagnosis Codes
The specific ADHD codes (F90.0, F90.1, F90.2, F90.8) should only be used when DSM-5 criteria are definitively met, including:
- Documented symptoms in more than one setting
- Clear functional impairment
- Symptoms present before age 12 (for adolescents)
- Alternative causes ruled out 1
Document Thoroughly
Your documentation should justify:
- Why the evaluation is incomplete
- What additional information is needed
- The plan for obtaining that information
- Current symptom severity and functional impact
Consider Comorbidity Screening
The guideline strongly recommends screening for comorbid conditions during ADHD evaluation 1. If you identify other concerns (anxiety, depression, learning problems), code those as well using appropriate ICD-10 codes.
Practical Algorithm
Step 1: Determine if DSM-5 criteria are met
- Yes → Use specific ADHD code (F90.0, F90.1, F90.2)
- No, but strong suspicion → Use F90.9 (unspecified ADHD) cautiously
- No, symptoms present but criteria not met → Use symptom codes (R41.840, R46.81, R46.89)
Step 2: Select E/M code based on visit complexity
- Consider time spent, data reviewed, and decision-making complexity
- ADHD evaluations typically justify 99214-99215 (established) or 99204-99205 (new)
Step 3: Add any identified comorbid condition codes
- Screen for and code anxiety, depression, learning problems, sleep issues as appropriate
Step 4: Document plan for completing evaluation
- Additional rating scales needed
- Teacher/school input required
- Follow-up visit scheduled
This approach ensures accurate billing while the diagnostic process unfolds, avoiding premature diagnosis assignment while still capturing the clinical work performed.