Left lower abdominal pain (Left lower quadrant pain) is a common presenting symptom in ambulatory, urgent care, and emergency settings. Accurate ICD-10 coding for left lower abdominal pain guides clinical communication, supports medical necessity, and directly affects reimbursement and compliance. Using the correct symptom code or a more specific diagnostic code when available reduces denials and improves care continuity.
This guide provides clinical context for left lower abdominal pain, explains when to use the ICD-10-CM symptom code, highlights common coding pitfalls, lists related ICD-10 codes, and gives actionable documentation and billing practices to improve revenue cycle outcomes.
The ICD-10-CM Code for Left lower quadrant pain is R10.32.
Left lower abdominal pain describes discomfort localized to the left lower quadrant (LLQ) of the abdomen. Medically, this symptom can arise from gastrointestinal, genitourinary, gynecologic, vascular, or musculoskeletal sources. Common etiologies include diverticulitis, ovarian pathology, ectopic pregnancy, renal/ureteral colic, inflammatory bowel disease, hernias, and musculoskeletal strain. R10.32 is a symptom code in the ICD-10-CM chapter for signs and symptoms and should be used when the clinician documents left lower quadrant pain as the presenting concern and no more specific diagnosis has been established or documented in the medical record.
Using R10.32 communicates that evaluation is focused on the symptom rather than a confirmed disease process. For coding and billing, symptom codes are appropriate when diagnostic testing is pending, indeterminate, or when the clinician documents only symptoms without a definitive diagnosis.
Use R10.32 when a patient presents with new-onset LLQ pain and the clinician documents left lower quadrant pain as the chief complaint but has not established a specific diagnosis during the encounter. Examples include ED triage or urgent care visits before imaging or lab results confirm a cause. R10.32 reflects medical necessity for evaluation and testing when ordered for the symptom.
When the visit is primarily to evaluate LLQ pain and diagnostic studies (e.g., CT abdomen/pelvis, pelvic ultrasound, urinalysis) are ordered but results are not yet available, code R10.32 to represent the symptom driving the encounter. If subsequent visits establish a specific etiology, replace the symptom code with the confirmed diagnosis on future claims.
For follow-up visits where the clinician documents continuing left lower quadrant pain and a specific cause remains unconfirmed, R10.32 is appropriate as the primary diagnosis. This applies when management is symptomatic and additional workup is ongoing.
When the visit is limited to assessment and advice for LLQ pain without definitive diagnosis or advanced diagnostic testing (for example, initial telehealth evaluation or triage calls), R10.32 accurately reflects the scope of the encounter and supports billed services.
If the clinician documents diverticulitis of the colon as the diagnosis, do not use R10.32. Assign the appropriate disease code for diverticulitis (for example, the applicable K57 category) because the symptom is attributable to a confirmed condition and the specific diagnosis better supports treatment and reimbursement.
Do not use R10.32 if the encounter documents a specific gynecologic diagnosis such as ruptured ovarian cyst, ectopic pregnancy, or ovarian torsion. Use the specific obstetric/gynecologic or surgical diagnosis codes instead, as they convey etiology and required interventions.
If imaging or clinical evaluation confirms kidney or ureteral stones as the cause of LLQ pain, code the calculi (for example, nephrolithiasis or ureterolithiasis) rather than the symptom. Specific codes better capture severity and guide reimbursement for procedures or admissions.
If the medical record later documents a definitive diagnosis that explains LLQ pain (e.g., inflammatory bowel disease flare, perforated viscus), the laterality of pain is superseded by the specific diagnostic code. Do not continue using the symptom code when a more-specific, clinically documented diagnosis exists.
| Condition | Code | When It Is Used | When It Is Not Used |
|---|---|---|---|
| Left lower quadrant pain | R10.32 | When the clinician documents LLQ pain as the presenting symptom and no definitive diagnosis is established during the encounter; appropriate for initial evaluations, pending workup, or symptomatic follow-ups. | When a specific etiology is documented (e.g., diverticulitis, ovarian torsion, ureterolithiasis); then assign the underlying disease code instead. |
| Right lower quadrant pain | R10.31 | Use when pain is localized to the right lower quadrant and the clinician documents this as the primary symptom without a confirmed diagnosis. | Not used for left-sided pain or when a specific right-sided diagnosis (e.g., appendicitis) is documented. |
| Abdominal pain, unspecified | R10.9 | Use when abdominal pain is documented without specified location or when documentation lacks sufficient detail to assign quadrant-specific codes. | Not used when the clinician specifies left or right lower quadrant pain or when a more specific diagnosis is provided. |
| Unspecified renal colic | N23 | Use when the clinician documents renal colic but the specific urinary calculus or laterality is not clarified and the visit focuses on symptomatic renal/ureteral pain. | Not used when LLQ pain is documented without urinary origin or when imaging confirms a calculi diagnosis with a more specific code. |
Specify "left lower quadrant" in the history and exam. Clear laterality supports code R10.32 and prevents miscoding as unspecified abdominal pain.
Document onset, duration, character (sharp, crampy), severity, and associated signs (fever, vomiting, vaginal bleeding, urinary symptoms). These details justify medical necessity for diagnostic testing and higher-level E/M services.
Explicitly state why labs or imaging were ordered for LLQ pain (e.g., rule out diverticulitis, pelvic source). Demonstrating that testing is tied to the symptom reduces denials for lack of medical necessity.
Replace R10.32 with the specific diagnosis code on subsequent claims when clinical results confirm the etiology. Retaining a symptom code after a confirmed diagnosis risks claim inaccuracies and audit findings.
Integrate CombineHealth.ai's AI-powered platform to validate code selection, perform automated claim scrubbing, and identify mismatches between documented diagnoses and submitted codes. This reduces edits, denials, and rework across the revenue cycle.
Coding for left lower abdominal pain has direct impact on revenue cycle outcomes:
Accurate ICD-10 coding is critical for healthcare revenue cycle performance. CombineHealth.ai's AI-powered platform helps RCM teams ensure coding accuracy, reduce denials, and optimize reimbursement through intelligent denial management and claim validation. CombineHealth.ai's intelligent platform provides automated claim scrubbing and coding validation to catch errors before submission, reducing denials and improving first-pass acceptance rates.
Q1: What is the ICD-10 code for left lower abdominal pain?
The ICD-10-CM code for left lower abdominal pain is R10.32. This is a symptom code used when the clinician documents LLQ pain but has not established a definitive diagnosis that explains the pain during that encounter.
Q2: When should I use R10.32 vs related codes?
Use R10.32 when the record documents left lower quadrant pain as the presenting complaint and no specific etiology is confirmed. Use R10.9 when the location is not specified. Replace R10.32 with a disease-specific ICD-10 code when testing or clinical evaluation yields a confirmed diagnosis (for example, diverticulitis or ureterolithiasis).
Q3: What documentation is required when coding for left lower abdominal pain?
Document the exact location (left lower quadrant), onset, duration, character, severity, associated symptoms, focused exam findings, and the clinical rationale for any labs or imaging. Note any provisional diagnoses and update the record with definitive findings when available to support code changes.
Q4: What are common denial reasons when coding for left lower abdominal pain?
Denials commonly arise from lack of specificity, failure to link diagnostic testing to the documented symptom, billing a symptom code after a specific diagnosis exists, and discrepancies between chart documentation and submitted codes. See our guide on denial management for strategies to reduce these denials.