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  6. 2026 ICD-10-CM Code G35.B

2026 ICD-10-CM Diagnosis Code G35.B

Primary progressive multiple sclerosis

ICD-10-CM Code:
G35.B
ICD-10 Code for:
Primary progressive multiple sclerosis
Is Billable?
Not Valid for Submission
Code Navigator:

G35.B is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of primary progressive multiple sclerosis. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Primary progressive multiple sclerosis

Non-specific codes like G35.B require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for primary progressive multiple sclerosis:

  • Use G35.B0 for Primary progressive multiple sclerosis, unspecified - BILLABLE CODE

  • Use G35.B1 for Active primary progressive multiple sclerosis - BILLABLE CODE

  • Use G35.B2 for Non-active primary progressive multiple sclerosis - BILLABLE CODE

Code Classification

  • Diseases of the nervous system
    G00–G99
    • Demyelinating diseases of the central nervous system
      G35-G37
      • Multiple sclerosis
        G35

Clinical Information

  • Multiple Sclerosis

    an autoimmune disorder mainly affecting young adults and characterized by destruction of myelin in the central nervous system. pathologic findings include multiple sharply demarcated areas of demyelination throughout the white matter of the central nervous system. clinical manifestations include visual loss, extra-ocular movement disorders, paresthesias, loss of sensation, weakness, dysarthria, spasticity, ataxia, and bladder dysfunction. the usual pattern is one of recurrent attacks followed by partial recovery (see multiple sclerosis, relapsing-remitting), but acute fulminating and chronic progressive forms (see multiple sclerosis, chronic progressive) also occur. (adams et al., principles of neurology, 6th ed, p903)

  • Multiple Sclerosis, Chronic Progressive

    a form of multiple sclerosis characterized by a progressive deterioration in neurologic function which is in contrast to the more typical relapsing remitting form. if the clinical course is free of distinct remissions, it is referred to as primary progressive multiple sclerosis. when the progressive decline is punctuated by acute exacerbations, it is referred to as progressive relapsing multiple sclerosis. the term secondary progressive multiple sclerosis is used when relapsing remitting multiple sclerosis evolves into the chronic progressive form. (from ann neurol 1994;36 suppl:s73-s79; adams et al., principles of neurology, 6th ed, pp903-914)

  • Multiple Sclerosis, Relapsing-Remitting

    the most common clinical variant of multiple sclerosis, characterized by recurrent acute exacerbations of neurologic dysfunction followed by partial or complete recovery. common clinical manifestations include loss of visual (see optic neuritis), motor, sensory, or bladder function. acute episodes of demyelination may occur at any site in the central nervous system, and commonly involve the optic nerves, spinal cord, brain stem, and cerebellum. (adams et al., principles of neurology, 6th ed, pp903-914)

  • ABCA12 wt Allele|ABC12|ARCI4A|ARCI4B|ATP Binding Cassette Subfamily A Member 12 wt Allele|ATP-Binding Cassette, Sub-Family A (ABC1), Member 12 Gene|ATP-Binding Cassette, Subfamily A, Member 12 Gene|DKFZP434G232|ICR2B|Ichthyosis Congenita II, Lamellar Ichthyosis B Gene|LI2

    human abca12 wild-type allele is located in the vicinity of 2q35 and is approximately 207 kb in length. this allele, which encodes glucosylceramide transporter abca12 protein, plays a role in both the membrane localization of glucosylceramide and other lipids in lamellar granules and in cholesterol transport. mutation of the gene is associated with autosomal recessive congenital ichthyosis (arci) types 4a and 4b (harlequin).

  • Lamellar Ichthyosis

    a very rare, autosomal recessive inherited skin disorder present at birth. it is characterized by the presence of a transparent membrane encasing the newborn. this membrane sheds in about two weeks after birth to reveal generalized scaling and skin erythema.

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026