Constipation ICD-10 Codes: Complete Guide for Accurate Coding

ICD-10 (International Classification of Diseases, 10th Revision) codes are the standardised medical codes used worldwide for clinical documentation, insurance billing, hospital records, and epidemiological tracking. When a patient presents with constipation, the correct ICD 10 constipation code must be assigned based on the type, duration, and underlying mechanism.

Whether you are a healthcare professional looking for the precise constipation ICD 10 code, a patient trying to understand your diagnosis, or a medical coder verifying the right code — this guide covers every constipation-related ICD-10 code in detail. Understanding the clinical definition of constipation also matters. Read more about what is constipation and how it is classified medically.

ICD 10 Code for Constipation — The Complete Breakdown

The primary ICD 10 code for constipation falls under Chapter XI: Diseases of the Digestive System, block K55–K64 (Other diseases of intestines).

K59.0 is the parent category code for all constipation types. In ICD-10-CM (the US clinical modification used in India and many international systems), this is further specified into sub-codes:

Chronic Constipation ICD 10 — Codes and Clinical Criteria

The ICD 10 code for chronic constipation is most accurately represented by K59.04 (Chronic idiopathic constipation) or K59.09 (Other constipation, which includes chronic constipation not elsewhere classified).

Clinically, chronic constipation ICD 10 documentation requires meeting the Rome IV criteria:

• Fewer than 3 spontaneous bowel movements per week for at least 3 months
• One or more of: straining, lumpy/hard stools (Bristol Type 1–2), incomplete evacuation sensation, anorectal obstruction sensation, or manual manoeuvres to facilitate defecation
• Symptoms present for at least 6 months total
• Loose stools are rarely present without laxative use

Chronic constipation is closely linked to gut microbiome imbalance, poor dietary fibre, and lifestyle factors. Understanding causes of constipation helps both in clinical documentation and in designing effective treatment.

Slow Transit Constipation ICD 10 — K59.01

Slow transit constipation ICD 10 code is K59.01. This is a specific subtype where the colon takes significantly longer than normal to move stool from the proximal to the distal colon.

Clinical features of slow transit constipation:

• Infrequent bowel movements (often 1–2 per week or less)
• Minimal urge to defecate
• Diffuse abdominal bloating and discomfort
• Confirmed by colonic transit studies (radio-opaque marker study or scintigraphy)
• Does not respond well to laxatives alone — often requires motility agents

Functional Constipation ICD 10 — Code and Distinction

Functional constipation ICD 10 refers to constipation that has no identifiable structural, neurological, or metabolic cause — it is a diagnosis of exclusion. The Rome IV criteria define functional constipation separately from IBS with constipation.

The most appropriate functional constipation ICD 10 code is K59.04 (Chronic idiopathic constipation) or K59.00 when documentation does not specify idiopathic chronicity.

Key distinction from IBS with constipation:

IBS with Constipation ICD 10 — K58.1

IBS with constipation ICD 10 code is K58.1 — this falls under the Irritable Bowel Syndrome category (K58), not the constipation category (K59). This is an important distinction for accurate coding.

IBS with constipation (IBS-C) is characterised by:

• Recurrent abdominal pain at least 1 day per week for 3 months
• Pain related to defecation
• Change in stool frequency or form associated with pain
• Hard or lumpy stools predominating (>25% of bowel movements)

Severe Constipation ICD 10 and Acute Constipation ICD 10

Neither "severe" nor "acute" constipation has a dedicated unique ICD-10 code — both are captured under K59.09 (Other constipation) with appropriate clinical documentation.

Severe Constipation ICD 10

Severe constipation ICD 10 is coded as K59.09. Severity is captured in clinical documentation and problem list notes rather than in a separate code. Severe constipation may also be associated with:

• K56.7 — Ileus, unspecified (when constipation has progressed to bowel obstruction)
• K56.0 — Paralytic ileus (in cases of neurogenic or medication-induced severe constipation)
• R19.7 — Diarrhoea, unspecified (paradoxical diarrhoea from overflow incontinence around an impacted stool)

Acute Constipation ICD 10

Acute constipation ICD 10 is also coded as K59.09. "Acute" indicates sudden onset constipation — often post-surgical, medication-induced, or following a dietary change — and should be distinguished from chronic constipation in clinical documentation even if the ICD code is the same.

History of Constipation ICD 10

A history of constipation ICD 10 — meaning past constipation that is currently resolved — is not coded as K59.0. Resolved conditions use personal history codes from the Z-code category.

The correct code for history of constipation ICD 10 is Z87.39 — Personal history of other diseases of the digestive system. There is no specific "history of constipation" Z-code, so Z87.39 is used as the appropriate personal history category.

Complete Constipation ICD 10 Code Reference Table

Constipation ICD 10 in Clinical Practice — What It Means for Patients

For patients, an ICD-10 constipation code on a diagnosis report or insurance claim simply confirms that constipation has been clinically documented. The specific code tells the treating team — and the billing system — the nature of the constipation.

If you have been diagnosed with a constipation ICD 10 code, it is worth understanding what type of constipation you have, because the treatment approach differs significantly:

• K59.01 (Slow transit): Requires motility support, not just laxatives — dietary fibre, physical movement, and sometimes prescription motility agents
• K59.02 (Outlet dysfunction): Often responds to pelvic floor physiotherapy rather than laxatives
• K59.04 (Chronic idiopathic): Responds well to comprehensive lifestyle change — fibre, hydration, gut microbiome support
• K58.1 (IBS-C): Requires gut-brain axis management — stress, diet, and sometimes low-FODMAP approach

For practical steps to manage any type of constipation, see improve digestion naturally at home and how gut health supports long-term bowel regularity. Supporting gut health and microbiome balance is beneficial across all constipation subtypes.

FAQs: Constipation ICD 10 Codes