The validity of International Classification of Diseases, Ninth Revision, Clinical Modification coding for pyoderma gangrenosum in hospital administrative data sets

Association of herpes zoster and chronic inflammatory skin disease in US inpatients

BACKGROUND

Patients with chronic inflammatory skin disease (CISD) have potential risk factors for herpes zoster (HZ). However, little is known about HZ risk in CISD.

OBJECTIVE

To determine whether CISD is associated with HZ.

METHODS

Data were analyzed from the 2002 to 2012 Nationwide Inpatient Sample, a representative cohort of US hospitalizations (N = 68,088,221 children and adults).

RESULTS

In multivariable logistic regression models including age, sex, race/ethnicity, insurance, household income, and long-term systemic corticosteroid use, hospitalization for HZ was associated with atopic dermatitis (adjusted odds ratio [95% confidence interval], 1.38 [1.14-1.68]), psoriasis (4.78 [2.83-8.08]), pemphigus (1.77 [1.01-3.12]), bullous pemphigoid (1.77 [1.01-3.12]), mycosis fungoides (3.79 [2.55-5.65]), dermatomyositis (7.31 [5.27-10.12]), systemic sclerosis (1.92 [1.47-2.53]), cutaneous lupus erythematosus (1.94 [1.10-3.44]), vitiligo (2.00 [1.04-3.85]), and sarcoidosis (1.52 [1.22-1.90]). Only lichen planus (crude odds ratio [95% confidence interval], 3.01 [1.36-6.67]), Sézary syndrome (12.14 [5.20-28.31]), morphea (2.74 [1.36-5.51]), and pyoderma gangrenosum (2.44 [1.16-5.13]) showed increased odds in bivariable models. Sensitivity analyses among those younger than 60 and younger than 50 years showed similar results. Predictors of HZ in CISD included female sex, fewer chronic conditions, and long-term systemic corticosteroid use.

LIMITATIONS

Cross-sectional study.

CONCLUSIONS

Many CISDs are associated with increased hospitalization for HZ, even below the ages recommended for HZ vaccination. Additional studies are needed to establish CISD-specific vaccination guidelines.

The inpatient burden and comorbidities of pyoderma gangrenosum in adults in the United States

Hospital admission is often necessary for management of pyoderma gangrenosum (PG), including wound care and pain control. No large-scale controlled studies examined the burden of hospitalization for PG. The objective of this study is to determine the prevalence, predictors, outcomes, and costs of hospitalization for PG in United States adults. Data were analyzed from the 2002 to 2012 National Inpatient Sample, including a 20% representative sample of United States hospitalizations. The prevalence of hospitalization for PG increased between 2002 and 2012. Primary admission for PG was associated with age 40-59 years, female sex, black race/ethnicity, second-quartile household income, public or no insurance, and multiple chronic conditions. PG admissions were more likely at teaching and medium or large hospitals. Geometric-mean length and cost of hospitalization were higher in inpatients with vs. without a primary diagnosis of PG. The majority of inpatients with PG were classified with minor (64.4%) or moderate (25.7%) likelihood of dying, but moderate (52.5%) and major (28.7%) loss of function. PG was associated with numerous other health disorders. The limitation of this study is the lack of data on PG treatment. This study demonstrated a substantial and increasing inpatient burden of PG in the United States, with considerable disability and mortality risk, multiple comorbid health disorders, and costs.