The principal diagnosis is shingles (Herpes zoster). As no specific complications are mentioned in the scenario, the correct code is 053.9, Herpes zoster without mention of complication. The patient's anxiety is an acute emotional response to the stress of the physical illness. This is most accurately captured by code 308.0, Acute reaction to stress, predominant disturbance of emotions. This code is more specific than a general anxiety code because it directly links the condition to a significant, identifiable stressor. The sequencing correctly places the primary reason for the encounter first.

B. 053.9, 308.3, 300.00: This option incorrectly includes multiple and redundant codes for the mental health condition. Coding both an acute stress reaction and an unspecified anxiety state is improper.

C. 053.8, 300.00: This option incorrectly uses 053.8 (Herpes zoster with other unspecified complications), which is not supported by the documentation, and the less specific anxiety code 300.00.

D. 053.8, 308.0: This option incorrectly codes shingles as "with other unspecified complications" (053.8), as the scenario does not describe any complications beyond the typical rash.

1. National Center for Health Statistics (NCHS)

Centers for Disease Control and Prevention (CDC). International Classification of Diseases

Ninth Revision

Clinical Modification (ICD-9-CM). 2013.

Page/Section: Tabular List of Diseases and Injuries. Code 053.9 is defined as "Herpes zoster without mention of complication." Code 308.0 is defined as "Acute reaction to stress

Predominant disturbance of emotions." This supports the selection of the most specific codes based on the provided clinical scenario.

2. Johns

M. L. Health Information Management Technology: An Applied Approach (4th ed.). AHIMA Press. 2013.

Page/Section: Chapter 7

"Clinical Classifications and Coding

" discusses the principle of assigning codes to the highest level of specificity documented. The scenario's description of an "anxiety that occurred as a reaction to the stress" directly aligns with the definition of an acute stress reaction (308.x) rather than a general anxiety state (300.00).

3. University of Illinois Chicago

Department of Biomedical and Health Information Sciences. BHIS 410: Medical Coding I Course Syllabus.

Page/Section: Course materials on "Coding Mental

Behavioral and Neurodevelopmental Disorders" emphasize the importance of identifying the relationship between physical and mental conditions. The guidelines instruct coders to select codes that reflect such relationships

making 308.0 (a reactive condition) more appropriate than 300.00 (a general state).