stricture is an abnormal, often permanent narrowing of a tubular structure, duct, or hollow organ in the body, typically resulting from the contraction of scar tissue (fibrosis) following inflammation, infection, trauma, or surgical intervention. While often used interchangeably with stenosis, “stricture” is more frequently applied to soft-tissue or mucosal passages (such as the urethra, esophagus, or bile ducts), whereas “stenosis” is often used for bony or vascular narrowing (such as spinal or aortic stenosis). The underlying pathological mechanism involves the replacement of normal elastic or muscular tissue with rigid, non-compliant collagenous scar tissue, which restricts the flow of fluids or solids through the lumen. Strictures are almost exclusively pathological, though physiological narrowing (such as the natural anatomical narrowing of the ureteropelvic junction) exists but is not clinically termed a stricture unless abnormally constricted. The most commonly coded forms in surgical specialties include urethral strictures (N35.x), esophageal strictures (K22.2), and lacrimal duct strictures (H04.55x). A key distinguishing feature is that a stricture is a fixed, structural narrowing, unlike a spasm, which is a temporary, reversible muscular contraction of the same passage.
Noun-forming suffix — “act of, process of, or result of”
The word entered English in the 1400s as stricture (noun), borrowed from Middle French stricture, from Late Latin strictura, from Latin stringere — literally “the result of drawing tight or binding.” The earliest medical application referring to the morbid narrowing of a canal appeared in the early 17th century. The root stringere (“to draw tight”) connects stricture to the entire strict- / STRING- FAMILY: restrict (to draw back tightly → to limit), constrict (to draw together tightly → to narrow), and astringent (binding or drawing together tissue). The combining form strict- is highly productive in medical terminology, appearing in terms describing narrowing or binding forces.
🔀 ALIASES / ALTERNATE TERMS
Strictured(adjective form — e.g., “strictured urethra,” “strictured esophageal segment”)
Narrowing(lay and clinical term; often used in imaging reports before a formal diagnosis of stricture is established)
Incomplete occlusion(partial or incomplete form of the condition; indicates the lumen is narrowed but not entirely blocked)
Stenosis(clinical descriptor synonym; frequently coded interchangeably depending on the specific organ system)
Contracture(related clinical entity; usually refers to muscle or joint scarring, but shares the same fibrotic mechanism; M24.5x)
Coarctation(systemic or syndromic form; specific term for congenital stricture/narrowing of the aorta; Q25.1)
Post-traumatic stricture(define by cause — resulting from injury, straddle trauma, or iatrogenic instrumentation)
Post-infective stricture(define by cause — resulting from infections such as gonorrhea or recurrent UTIs)
Urethral stricture(organ/tissue-specific form; common in urology, affecting male anterior/posterior urethra; N35.x)
Esophageal stricture(organ/tissue-specific form; common in ENT/GI, often secondary to GERD or radiation; K22.2)
Lacrimal stenosis/stricture(organ/tissue-specific form; common in ophthalmology, causing epiphora; H04.55x)
Ureteral stricture(organ/tissue-specific form; narrowing of the ureter causing hydronephrosis; N28.46)
🔗 RELATED TERMS
Dilation — the opposite of stricture; the widening or expansion of a hollow organ or passage, either physiologically (e.g., pupillary dilation) or therapeutically (e.g., balloon dilation of a stricture).
Constriction — shares the strict- root; the physiological or pathological process of narrowing, often active (muscular) rather than passive (scarring).
Spasm — a sudden, involuntary muscle contraction that temporarily narrows a passage; distinguished from stricture because it is reversible with muscle relaxants or time, whereas a stricture is fixed scar tissue.
Fibrosis — the physiological mechanism or process of excess fibrous connective tissue development in an organ or tissue, which is the primary cellular cause of a stricture.
Fibrotic — adjective describing tissue that has become thickened, scarred, and non-compliant, leading to stricture formation.
Cicatrization — the programmed cellular process of scar formation underlying the pathological development of strictures after mucosal injury.
Meatal stenosis — acquired or congenital narrowing specifically at the external urethral meatus (N36.2).
Laryngotracheal stenosis — clinical entity defined by fibrotic narrowing of the airway, often post-intubation (J38.6, J39.8).
Nasolacrimal duct obstruction (NLDO) — clinical entity defined by stricture of the tear drainage system, leading to overflow tearing (H04.53x).
Pelviureteric junction (PUJ) obstruction — stricture or narrowing at the specific anatomic site where the renal pelvis meets the ureter (Q62.11).
Retrograde urethrogram (RUG) — primary or key diagnostic tool for evaluating the location, length, and severity of a urethral stricture.
Accidental puncture and laceration of a genitourinary system organ or structure during a genitourinary system procedure (often the etiology of iatrogenic stricture)
Cystourethroscopy, with calibration and/or dilation of urethral stricture or stenosis, with or without meatotomy, with or without injection procedure for cystography, male or female
Probing of nasolacrimal duct, with or without irrigation; with insertion of tube or stent
⚠️ Coding Note: When coding strictures for inpatient profee billing, etiology and exact anatomic location are paramount. For urethral strictures, the ICD-10-CM code must specify male vs. female, the etiology (post-traumatic, post-infective, or other), and the specific segment (meatal, bulbous, membranous, or anterior). A common undercoding error is defaulting to N35.9 (unspecified) when the operative note clearly describes a “bulbous stricture” or notes a history of trauma/catheterization; query the provider if the etiology is implied but not explicitly linked. If the stricture is a complication of a previous medical procedure (e.g., post-radiation or post-surgical scarring), sequencing rules require coding the complication (e.g., T-code for complication of care) first, followed by the specific stricture code. For ophthalmology (lacrimal strictures), laterality is strictly required; failure to append the correct 6th character (1 for right, 2 for left, 3 for bilateral) will result in a Noridian MAC denial.