S30.821S Blister (nonthermal) of abdominal wall, sequela

ICD-10-CM Code S30.821S: Blister (nonthermal) of abdominal wall, sequela

ICD-10-CM code S30.821S is identified as a blister (nonthermal) of the abdominal wall, sequela. It is listed within the S30 category for superficial injury of abdomen, lower back, pelvis and external genitals. The code appears in official billing and coding materials and clinical code tree references, which establish its specific label and place in the ICD-10-CM hierarchy. 2 3

Plain-language overview

Code S30.821S is labeled as blister (nonthermal) of abdominal wall, sequela in the ICD-10-CM system. This code is listed in official billing and coding articles alongside other superficial injury codes. 2

What this code represents

The code S30.821S represents a blister (nonthermal) of the abdominal wall with a sequela encounter character. It is grouped under the S30 category for superficial injury of abdomen, lower back, pelvis and external genitals. 2 3

Coding details

The S30.821 code series includes different seventh characters for encounter type, including S30.821A for initial encounter, S30.821D for subsequent encounter, and S30.821S for sequela. These variations are listed within the S30.8 code tree. 3

The code tree for S30 includes other nonthermal blister sequela codes for different anatomical sites, such as S30.823S for scrotum and testes and S30.826S for unspecified external genital organs, female. This establishes the structural organization of similar diagnoses. 3

Documentation considerations

The supplied excerpts identify the official code label and its hierarchical placement but do not provide specific clinical documentation elements or criteria for using this sequela code. No documentation rules are explicitly stated in the provided source texts. 2 3

What the sources add

A Centers for Medicare and Medicaid Services billing and coding article explicitly lists S30.821S with its full official description. An unboundmedicine.com code tree reference places this same code within the broader S30 category and lists its initial, subsequent, and sequela variants. 2 3

Coverage and utilization context

The code S30.821S appears in a CMS billing and coding article concerning debridement services. The provided excerpt lists the code but does not state any specific coverage criteria, payment rules, or utilization guidelines for this diagnosis. 2

Questions to verify

The provided sources do not establish the clinical definition of a sequela for this specific code, nor do they detail the exact anatomical boundaries of the abdominal wall as it applies here. Further official ICD-10-CM guidelines would be needed to verify these specifics. 2 3

Sources

1. Article - Billing and Coding: Medicare Preventive Coverage for Certain Vaccines (A54767) — cms.gov; accessed 2026-07-26.
2. Article - Billing and Coding: Debridement Services (A56459) — cms.gov; accessed 2026-07-26.
3. ICD-10-CM 2024 | S30 - Superficial injury of abdomen, lower back, pelvis and external genitals — unboundmedicine.com; accessed 2026-07-26.