Oral submucosal fibrosis, including of tongue

This code represents a chronic, progressive, and precancerous condition affecting the oral mucosa, characterized by juxta-epithelial inflammatory reaction and progressive fibrosis of the lamina propria and deeper connective tissues. It leads to increasing stiffness and trismus (difficulty opening the mouth), often involving the buccal mucosa, palate, and tongue.

Apply this code when documentation explicitly states a diagnosis of oral submucosal fibrosis, including when the tongue is specifically mentioned as an affected site. This diagnosis is typically made based on clinical examination revealing blanching, stiffness, and palpable fibrous bands, often confirmed by biopsy.

• Ensure documentation specifies "oral submucosal fibrosis" to differentiate from other oral fibrotic conditions.
• Do not use for localized oral fibromas or scar tissue unless the systemic, progressive nature of submucosal fibrosis is clearly indicated.
• Consider co-reporting with codes for associated risk factors, such as betel quid chewing, if documented.