Cleft Lip and Cleft Palate — Clinical Documentation Guide (2026)

This Clinical Documentation Guide (CDG) provides AAPC/AHIMA-credentialed coders and CDI specialists with comprehensive coding, clinical, and documentation guidance for cleft lip and cleft palate conditions (ICD-10-CM Q35–Q37). Content reflects FY2026 ICD-10-CM guidelines (effective October 1, 2025 – September 30, 2026) and incorporates the most current epidemiological, clinical, and CPT coding resources. Use this guide to ensure accurate diagnosis code assignment, appropriate CDI query triggers, and defensible documentation for cleft lip/palate encounters across all care settings.

🔍 1. Definition

Cleft lip is a congenital birth defect occurring when the tissue that forms the lip fails to join completely before birth, resulting in an opening or split in the upper lip. The opening can range from a small notch at the vermilion border to a large gap extending through the upper lip into the nose. It can occur on one or both sides of the lip, or rarely in the midline, as described by CDC.

Cleft palate is a congenital defect in which the tissue forming the roof of the mouth (palate) does not join completely during fetal development, leaving a persistent opening between the oral and nasal cavities. The cleft may affect the hard palate (anterior bony roof), the soft palate (posterior muscular structure), or both, according to NIDCR.

Cleft lip with cleft palate (combined) occurs when both the lip and the palate fail to fuse; these combination defects constitute the most clinically significant and surgically complex form of orofacial clefting. Together, cleft lip and cleft palate are classified as orofacial clefts and represent one of the most common congenital craniofacial anomalies, as noted in StatPearls (NCBI).

Submucous cleft palate is the mildest form, characterized by incomplete fusion of the palatal muscles beneath an intact oral mucosa; it may present only as a bifid uvula and is often not diagnosed at birth.

Prevalence / Epidemiology (Current Data)

Based on updated 2025 data from ACPA (August 2025), ACPA now recommends the following statement for healthcare organizations:

"Between 6,000 and 8,000 children are born yearly in the United States with a cleft lip and/or palate. In the United States, about 1 in 1,050 babies is born with cleft lip with or without cleft palate, and about 1 in 1,600 babies is born with cleft palate alone."

Detailed NIDCR prevalence data (2010–2014 base), from the National Birth Defects Prevention Network (NBDPN), provides annual estimates:

Source: Mai CT, et al. Birth Defects Research. 2019;111:1420–35; data from 13 U.S. surveillance programs, 5,186,504 live births, adjusted for maternal race/ethnicity.

Contemporary EHR-based research in the Journal of Clinical Medicine (2024) found slightly higher prevalence rates in a cohort of 15.7 million patients: cleft palate (ICP) 1 in 971 births and combined cleft lip and palate (CLP) 1 in 1,398 births.

Demographic patterns:

• Prevalence is highest in Asian, Native American/Alaskan Native populations; lower in Black patients
• Isolated cleft palate is more frequent in biological females; cleft lip ± palate has a greater male-to-female ratio, per ASHA
• Left-sided unilateral cleft lip is more common than right-sided
• Approximately 70% of cleft lip ± palate cases and 50% of isolated cleft palate cases are non-syndromic, per PMC/Oral Diseases

Risk factors documented by CDC include:

• Maternal smoking during pregnancy
• Pregestational diabetes
• Use of certain antiepileptic medications during the first trimester (topiramate, valproic acid)
• Genetic mutations/changes (multifactorial inheritance)

🗂️ 2. Alternative Terminology

Medical coders and CDI specialists will encounter multiple terms in documentation that map to Q35–Q37 codes. The following table summarizes acceptable and deprecated terminology:

Coder note: When the term "harelip" appears in provider documentation, query for clarification of current terminology and laterality where clinically feasible. The code maps to Q36 (Cleft lip) but documentation specificity is needed for the correct 4th-character subcode.

🩺 3. Common Signs & Symptoms

At Birth / Clinical Presentation

Most cleft lip presentations are visually apparent at birth. Cleft palate without lip involvement may be identified through routine oral examination of the newborn, per Mayo Clinic (2024):

• Cleft lip: Visible split in the upper lip, ranging from a small notch at the vermilion border to a large opening extending into the nose; may be unilateral (one side), bilateral (both sides), or median (midline — rare)
• Cleft lip with or without palate: Detectable on prenatal ultrasound around 18 weeks gestation; 2D ultrasonography more reliable for cleft lip than cleft palate; 3D ultrasound can achieve 100% sensitivity for cleft palate if cleft lip is already identified, per StatPearls
• Cleft palate only: Often identified postnatally during oral examination; may be missed if submucous (mucosa intact)
• Submucous cleft palate: Signs include a translucent zona pellucida (midline thinning) on the soft palate, bifid uvula, and posterior notch of the hard palate palpable bimanually; may not be diagnosed until the child begins to speak

Feeding Difficulties

Feeding challenges are the most immediate neonatal concern per NIDCR and StatPearls:

• Inability to form adequate nipple seal and latch (particularly with cleft palate)
• Nasal regurgitation of feeds
• Increased work of feeding, leading to fatigue and poor weight gain
• Suck-swallow-breathe discoordination
• Increased air intake during feeds

Ear Infections and Hearing Issues

• Eustachian tube dysfunction is nearly universal with cleft palate because the levator veli palatini muscle, which opens the Eustachian tube, is malpositioned and inserts onto the hard palate rather than creating the palatal sling, per Mayo Clinic
• Middle ear effusion (MEE) and recurrent otitis media with effusion are extremely common
• Conductive hearing loss from chronic middle ear fluid is a major associated complication; ASHA notes newborn hearing screens are frequently passed despite subsequent risk of conductive loss

Speech and Language Complications

Per ASHA:

• Hypernasality: Excessive nasal resonance due to open oral-nasal communication
• Nasal air emission: Audible or inaudible escape of air through the nose on pressure consonants (stops, fricatives, affricates)
• Compensatory articulation errors: Glottal stops, pharyngeal fricatives — maladaptive patterns developed in response to abnormal palatal structure
• Delayed expressive language in early childhood, typically resolving with intervention
• Velopharyngeal insufficiency (VPI): Persistent inability of the palate to close against the posterior pharyngeal wall after repair

Dental Issues

• Dental malposition, supernumerary or missing teeth at the cleft line (between lateral incisor and canine)
• Alveolar cleft requiring bone grafting
• Malocclusion (Class III common with bilateral CLP; Class II common with Pierre Robin sequence)
• Per CDC: dental complications require specialized orthodontic care throughout childhood and adolescence

Psychosocial Impact

Children with orofacial clefts may face social, emotional, and behavioral challenges due to visible facial differences and the stress of multiple medical procedures, per Mayo Clinic.

🧭 4. Differential Diagnosis

When cleft lip/palate is documented, coders and CDI specialists should be alert to associated syndromic diagnoses that require separate coding. Approximately 15–30% of cases are syndromic, per StatPearls and PMC Indian Journal of Plastic Surgery.

Coder/CDI note: Approximately 50% of isolated cleft palate cases are associated with other anomalies, versus 15% of cleft lip with palate cases, per StatPearls. If a confirmed syndrome is documented, code the syndrome separately using the appropriate code (e.g., Q87.x, Q93.81 for 22q11.2 deletion). Review genetic consultation reports for documented syndrome diagnoses.

📋 5. Clinical Indicators (for Coders/CDI)

The following documentation elements must be present or queried to assign the most specific ICD-10-CM code from Q35–Q37. Per WellCare Documentation Guidance (2024) and AAOMS Coding Paper (revised January 2026):

Required Documentation Elements

Post-repair Encounters

When a patient returns for reconstructive surgery after prior repair:

• The original cleft code (Q35–Q37) should still be used if the cleft condition is the reason for the encounter (e.g., revision surgery, VPI correction)
• Z42.8 (Encounter for other plastic and reconstructive surgery following medical procedure or healed injury) may be applicable for follow-up reconstruction visits
• Personal history codes (Z87.39x) apply if the condition has been fully corrected and is no longer relevant to the current encounter

🦴 6. Anatomy & Pathophysiology

Embryological Development of the Lip

The normal lip forms through the fusion of multiple embryonic facial processes during gestational weeks 4 through 7, per CDC and PMC/Oral Diseases embryology review (2022):

1. Week 4: Five facial prominences form around the developing oral cavity — the frontonasal prominence (median), bilateral maxillary prominences, and bilateral mandibular prominences
2. Week 5: The frontonasal prominence develops into medial and lateral nasal processes via cleavage; these fuse with the maxillary process to form the upper lip
3. Week 6: The medial nasal processes fuse in the midline to form the intermaxillary segment, which creates the philtrum of the upper lip and the primary palate (the portion anterior to the incisive foramen)

Failure mechanism (cleft lip): Failure of the lateral lip element (maxillary prominence) to fuse with the philtrum (medial nasal prominence from the frontonasal prominence) produces a unilateral cleft lip. Failure of both maxillary prominences to fuse produces bilateral cleft lip, per Plastic Surgery Key embryology review.

Embryological Development of the Palate

The secondary palate forms from outgrowths of the maxillary processes (palatal shelves) in a more protracted developmental window, per StatPearls and PMC/Oral Diseases (2022):

1. Week 6–7: Palatal shelves grow initially in a vertical orientation on either side of the tongue
2. Week 8: Palatal shelves rapidly reorient from vertical to horizontal (within hours), progressing anteriorly to posteriorly in a "zipper" fashion
3. Weeks 8–10: The two palatal shelves make contact at the midline; medial edge epithelium degenerates via programmed cell death (apoptosis) to establish mesenchymal continuity
4. Week 10–12: Mesenchymal continuity is established; the anterior portion ossifies to form the hard palate while the posterior portion differentiates into muscle to form the soft palate

Failure mechanism (cleft palate): Failure of the palatal shelves to reach the midline and fuse produces cleft palate. The cause of Pierre Robin sequence is distinct: mechanical obstruction by the tongue (due to micrognathia) prevents the palatal shelves from assuming their horizontal position, resulting in the characteristic inverted U-shaped cleft palate, per PMC IJPS.

Molecular Pathways

Key molecular signaling pathways involved per StatPearls and PMC/Oral Diseases:

• Sonic hedgehog (SHH) pathway — regulates medial nasal process development and facial midline formation
• Bone morphogenetic protein (BMP4, BMP2) pathways — regulate apoptosis and epithelial seam degeneration
• Fibroblast growth factor (FGF10, FGF7) pathways
• Transforming growth factor beta (TGFβ) — palatal shelf elevation and fusion
• IRF6 — mutations cause Van der Woude syndrome; rs642961 risk allele linked to non-syndromic CL/P
• TFAP2A mutations underlie branchio-oto-renal syndrome, which includes CL/P

Functional Consequences (Pathophysiology)

Per StatPearls:

• Oral-nasal communication: The persistent cleft creates abnormal communication between oral and nasal cavities, impeding:
  • Sucking (infants are obligate nasal breathers; tongue can protrude into nasal cavity)
  • Speech (prevents buildup of intraoral air pressure for plosive/fricative sounds)
  • Swallowing (nasal regurgitation)
• Eustachian tube dysfunction: Abnormal insertion of the levator veli palatini leads to impaired tube opening and middle ear effusion
• Dental/skeletal effects: Disrupted maxillary architecture leads to dental malposition and abnormal facial growth if untreated

💊 7. Medication Impact / Treatment

The “Rule of 10s” for Surgical Timing

A widely used perioperative guideline for cleft lip repair is the "Rule of 10s" (also called "Ten's criteria"), per StatPearls:

• Weight ≥ 10 pounds (infant is metabolically stable enough for anesthesia)
• Hemoglobin ≥ 10 g/dL
• Age ≥ 10 weeks (cardiac risk decreases significantly after 60 weeks post-conceptional age)

Surgical Timeline Overview

The following timeline reflects ACPA Parameters of Care (2009 Rev., still current standard) and StatPearls (2024):

Lip repair is recommended within the first 12 months of life; palate repair is recommended within the first 18 months of life, per CDC.

Pre-surgical Preparation (Infancy)

• Lip taping: Applied from approximately 1 week of age to narrow the cleft and improve nasal symmetry pre-operatively, per StatPearls
• Nasoalveolar molding (NAM) prosthesis: A custom maxillary intraoral device worn 24 hours/day, adjusted weekly or biweekly, to remodel alveolar segments and improve nasal symmetry prior to lip repair; billed using CPT 21076 per AAOMS (January 2026)

Feeding Devices

• Specialized bottles (e.g., Mead-Johnson Cleft Palate Nurser, Haberman feeder, Dr. Brown's Specialty Feeder, Pigeon bottle) are used to enable feeding without the ability to create negative intraoral pressure
• Occupational/speech therapists train caregivers on positioning, pacing, and special nipple/bottle techniques
• Palatal obturators may be used in selected cases to cover the palatal cleft before surgical repair to facilitate feeding

Team-Based Care Model

ACPA mandates that care be delivered by an interdisciplinary cleft and craniofacial team that typically includes:

• Plastic surgeon or craniofacial surgeon
• Oral and maxillofacial surgeon
• Orthodontist
• Pediatric dentist
• Speech-language pathologist
• Audiologist
• Otolaryngologist (ENT)
• Geneticist / genetic counselor
• Social worker / psychologist
• Pediatrician
• Nutritionist

Medications

There is no specific medical (pharmaceutical) treatment for cleft lip/palate itself. Perioperative medications include:

• General anesthesia for surgical repair
• Analgesics post-operatively
• Antibiotics if indicated (perioperative prophylaxis per surgeon protocol)

Teratogenic medication note for CDI: Documentation of maternal use of topiramate or valproic acid during the first trimester in the mother's record is relevant to etiology; these are not coded on the child's record but represent risk factors per CDC.

Preview ends here. The full guide continues with FY2026 ICD-10-CM code sets, CPT surgical coding, MS-DRG mapping, reimbursement guidance, CDI query templates, and an audit checklist — all available to CCO Members.