Non-Billable / Non-Specific Code
ICD-10-CM K51.21 is the diagnosis code for Ulcerative (chronic) proctitis with complications. This code falls under the section "Noninfective enteritis and colitis" within Chapter 11 — Diseases of the digestive system (K00-K95). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where K51.21 sits in the ICD-10-CM classification helps ensure proper coding:
No, K51.21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
K51.21 is the ICD-10-CM diagnosis code for "Ulcerative (chronic) proctitis with complications". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of K51.21 is K51.2 ("Ulcerative (chronic) proctitis"). K51.21 provides a more specific classification within this category.
K51.21 is located in Section K50-K52 — "Noninfective enteritis and colitis" within Chapter 11 of the ICD-10-CM Tabular List.
K51.21 has 6 sub-code(s) that provide more specific detail: K51.211, K51.212, K51.213, K51.214, K51.218 and more.
Use K51.21 when the patients documented diagnosis matches "Ulcerative (chronic) proctitis with complications" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Ulcerative (chronic) proctitis with complications is K51.21.
No, K51.21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
K51.21 is in Chapter 11 of the ICD-10-CM Tabular List.
Yes, K51.21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.