What does ICD-10 code M40.30 mean?

ICD-10 code M40.30 is the standardized code used for flatback syndrome, site unspecified in medical records and coding systems.

When is ICD-10 code M40.30 used?

Doctors, hospitals, and insurers may use ICD-10 code M40.30 when recording flatback syndrome, site unspecified in a standardized format.

Does ICD-10 code M40.30 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10BillableValid for clinical use

ICD-10 Code M40.30: Flatback syndrome, site unspecified

Name: ICD-10 Code M40.30: Flatback syndrome, site unspecified
Creator: HealthAssure Clinical Team
Published: 2026-05-26T12:46:38.762Z

M40.30 is a billable ICD-10 diagnosis code used to classify Flatback syndrome, site unspecified in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the musculoskeletal system and connective tissue (M00-M99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the musculoskeletal system and connective tissue (M00-M99).

When is it used?

May be used when a clinician documents flatback syndrome, site unspecified in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter

13Diseases of the musculoskeletal system and connective tissue (M00-M99)

block

M40-M54Dorsopathies

block

M40-M43Deforming dorsopathies

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Orthopedic SpecialistRheumatologist

Sibling codes

M40.35Flatback syndrome, thoracolumbar regionbillable M40.36Flatback syndrome, lumbar regionbillable M40.37Flatback syndrome, lumbosacral regionbillable

Coverage-related procedures and services

CPT 95940high

CONTINUOUS INTRAOPERATIVE NEUROPHYSIOLOGY MONITORING IN THE OPERATING ROOM, ONE ON ONE MONITORING REQUIRING PERSONAL ATTENDANCE, EACH 15 MINUTES (LIST SEPARATELY IN ADDITION TO CODE FOR PRIMARY PROCEDURE)

Source: CMS coverage guidance

HCPCS G0453high

CONTINUOUS INTRAOPERATIVE NEUROPHYSIOLOGY MONITORING, FROM OUTSIDE THE OPERATING ROOM (REMOTE OR NEARBY), PER PATIENT, (ATTENTION DIRECTED EXCLUSIVELY TO ONE PATIENT) EACH 15 MINUTES (LIST IN ADDITION TO PRIMARY PROCEDURE)

Source: CMS coverage guidance

Mapped diagnoses and classifications

SNOMED_CT 203665007high

Flatback syndrome

Source: SNOMED International ICD-10 map

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.

Legacy codes

M40.30

Common synonyms

Flatback syndrome, site unspecifiedFlatback syndrome, site

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.