P83.5 vs Q55
P83.5 and Q55 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on Q55
congenital hydrocele (P83.5)
P83.5
Congenital hydrocele
Billable
- Chapter 16
- Certain conditions originating in the perinatal period
- Section
- P80-P83
Indexed under
- Hydrocele › congenital (spermatic cord) (testis) (tunica vaginalis)
- Hydrocele › newborn (spermatic cord) (testis) (tunica vaginalis)
- Hydrocele › communicating › congenital (spermatic cord) (testis) (tunica vaginalis)
- Anomaly, anomalous › genitalia, genital organor system › male › hydrocele (congenital) (unspecified type)
Q55
Other congenital malformations of male genital organs
Not billable
- Chapter 17
- Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
- Section
- Q50-Q56
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027