2027 ICD-10-CM Diagnosis Code R43.0Anosmia
ICD-10-CM Codes›R00–R99›R40-R46›R43
- Billable — Valid for Submission
- Not Chronic
R43.0 is a billable ICD-10-CM diagnosis code for anosmia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as congenital anosmia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system signs and symptoms.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Congenital anosmia
- Congenital hypoplasia of nose
- Congenital insensitivity to pain, anosmia, neuropathic arthropathy
- Disorder of smell
- Hypoplasia of eye
- Hyposmia, nasal and ocular hypoplasia, hypogonadotropic hypogonadism syndrome
- Loss of sense of smell
- Mucosal anosmia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to R43.0: its own notes plus those printed at block R40-R46 and Chapter 18. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- The conditions and signs or symptoms included in categories R00-R94 consist of:
- (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- (e) cases in which a more precise diagnosis was not available for any other reason;
- (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Anosmia R43.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Anosmia
complete or severe loss of the subjective sense of smell. loss of smell may be caused by many factors such as a cold, allergy, olfactory nerve diseases, viral respiratory tract infections (e.g., covid-19), aging and various neurological disorders (e.g., alzheimer disease).
Patient EducationClinical
Taste and Smell Disorders
Our senses of taste and smell give us great pleasure. Taste helps us enjoy food and beverages. Smell lets us enjoy the scents and fragrances like roses or coffee. Taste and smell also protect us, letting us know when food has gone bad or when there is a gas leak. They make us want to eat, ensuring we get the nutrition we need.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert R43.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R43.0Overview
What is the ICD-10 code for anosmia?
The ICD-10-CM code for anosmia is R43.0 (sometimes written as R430). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is R43.0 (Disturbances of smell and taste) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anosmia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does R43.0 group to?
When anosmia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.
Can R43.0 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the anosmia is established, that condition takes the principal position instead.
What is the ICD-9 equivalent of R43.0?
Under the General Equivalence Mappings, anosmia converts to ICD-9-CM 781.1 (smell & taste disturb). The mapping is approximate, so confirm the match fits the documentation.
