K31.B — Hypertrophic pyloric stenosis, in childhood
Is K31.B billable?
Yes — K31.B is billable for FY2027. K31.B is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K31.B may be submitted for encounters from October 1, 2026 through September 30, 2027. K31.B is new in FY2027.
K31.B at a glance
| Code | K31.B |
|---|---|
| Description | Hypertrophic pyloric stenosis, in childhood |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| FY2027 change | New in FY2027 |
Which MS-DRGs does K31.B group to?
K31.B sits in MDC 06 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 380Complicated Peptic Ulcer with MCCmedical
- 381Complicated Peptic Ulcer with CCmedical
- 382Complicated Peptic Ulcer without CC/MCCmedical
As a secondary diagnosis, K31.B is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is K31.B listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to K31.B. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Stenosis, stenotic › pylorus › in childhood (cicatricial)
- Stenosis, stenotic › pylorus › infantile (cicatricial)
- Stenosis, stenotic › pylorus › pediatric (cicatricial)
- Stricture › pylorus › infantile
Excludes1 — never code together
The conditions below can never be reported together with K31.B on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- congenital pyloric stenosis (Q40.0)
Inclusion terms
Alternative wording in documentation that is classified to K31.B.
- Infantile hypertrophic pyloric stenosis
- Pediatric hypertrophic pyloric stenosis
- Pediatric pyloric stenosis
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K31.B, but a patient may have both at the same time. When documentation supports it, K31.B and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Excludes2 — not included here — inherited from K20-K31
The conditions below are not part of K31.B, but a patient may have both at the same time. When documentation supports it, K31.B and the excluded code may both be reported.
- hiatus hernia (K44.-)
Excludes2 — not included here — inherited from K31
The conditions below are not part of K31.B, but a patient may have both at the same time. When documentation supports it, K31.B and the excluded code may both be reported.
Which codes are confused with K31.B?
ICD-10-CM declares these codes mutually exclusive with K31.B — exactly one of each pair can be correct for a given encounter.
What other codes are in the K31 family? (11)
- K31.0Acute dilatation of stomach
- K31.1Adult hypertrophic pyloric stenosis
- K31.2Hourglass stricture and stenosis of stomach
- K31.3Pylorospasm, not elsewhere classified
- K31.4Gastric diverticulum
- K31.5Obstruction of duodenum
- K31.6Fistula of stomach and duodenum
- K31.7Polyp of stomach and duodenum
- K31.8Other specified diseases of stomach and duodenumnot billable
- K31.9Disease of stomach and duodenum, unspecified
- K31.AGastric intestinal metaplasianot billable