Body Surface Area
BSA
Percentage of total body surface affected.
—%
BSA
Palm method — one patient palm including fingers is about 1% of their body surface. Count palms, or estimate by region.
Head and neck9% of body
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Right arm9% of body
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Left arm9% of body
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Trunk, front18% of body
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Trunk, back18% of body
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Right leg18% of body
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Left leg18% of body
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Genitals1% of body
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ThresholdBSA 10 % or above. Our documentation criteria require BSA >= 10% — OR involvement of hands, feet, face, neck or genital area, which most policies accept below threshold. Record the special site explicitly.
Investigator's Global Assessment
IGA
Static global severity, scored 0 to 4.
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IGA
Single overall judgment of current disease severity.
ThresholdIGA 3 score or above. Our criteria require IGA 3 or 4 (moderate or severe).
Physician's Global Assessment
PGA
Clinician-rated global severity, scored 0 to 4. Used interchangeably with IGA by many plans.
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PGA
Single overall judgment of current plaque severity.
ThresholdPGA 3 score or above. Treated as equivalent to IGA 3-4 by most policies.
Dermatology Life Quality Index
DLQI · license required
Ten-item quality-of-life questionnaire, scored 0-30.
Not implemented — license requiredCardiff University. Copyright held by Cardiff University. Commercial use requires a license and a fee. Not implemented here until that is cleared. Until that is cleared, record this instrument on paper and enter the total in the chart line manually.