R91.1 — Solitary pulmonary nodule

R91.1

ICD-10 Chapter 18: Symptoms, Signs & Abnormal Findings — illustrative image — Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99) — illustrative image

What this code means

A solitary pulmonary nodule is a single round spot found on a lung scan, most often benign but usually followed up.

Also called: solitary pulmonary nodule, lung nodule, spn.

When this code is used

Used for solitary pulmonary nodule.

Where it sits in ICD-10-CM

Code R91.1 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related anatomy

Lungs

Frequently asked questions

What is ICD-10-CM code R91.1?

R91.1 is the ICD-10-CM diagnosis code for “Solitary pulmonary nodule”. A solitary pulmonary nodule is a single round spot found on a lung scan, most often benign but usually followed up.

When is code R91.1 used?

Used for solitary pulmonary nodule. It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.