ICD-10-CM · Spine

M99.83

M99.83 classifies biomechanical lesions of the lumbar region that do not fit the more specific M99 subcategory definitions — a catch-all for lumbar-region biomechanical dysfunction not elsewhere captured in the M99 hierarchy.

Verified May 8, 2026 · 5 sources ↓

Status: Billable
Chapter: 13
Related CPT: 10
Region: Spine

Drawn from CDCICD10DataCMSOpsc

Documentation tips

What should appear in the chart to support M99.83.

Source · Editorial brief grounded in 5 cited references ↓

Specify the lumbar region explicitly — note which lumbar levels are involved (e.g., L3-L5) to support medical necessity and distinguish from thoracic or sacral findings.
Document why a more specific code (disc disorder M51.x, spondylosis M47.x, segmental dysfunction M99.03) was not used — the record should reflect the clinical rationale for landing on M99.83.
Record the biomechanical finding that drives the diagnosis: restricted range of motion, aberrant movement pattern, asymmetric loading, or manual examination findings that do not constitute a subluxation complex.
If lumbosacral involvement is documented, M99.83 is the correct code per the Alphabetic Index — note 'lumbosacral' explicitly in the encounter note so the mapping is traceable.
When billing Medicare chiropractic services, confirm whether the payer's LCD requires an M99.0x subluxation code as primary; M99.83 may need to be secondary or may not satisfy coverage criteria on its own.

Related CPT procedures

Procedure codes commonly billed with M99.83. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

98940 $26.72

Chiropractic manipulative treatment of one or two spinal regions in a single visit, used when the chiropractor adjusts a limited area such as the cervical or lumbar spine.

98941 $38.41

Chiropractic manipulative treatment of three or four spinal regions during one encounter, the most common level when neck, mid back, and low back are adjusted together.

98942 $49.77

Chiropractic manipulative treatment of all five spinal regions in one visit: cervical, thoracic, lumbar, sacral, and pelvic.

97110 $29.06

Therapeutic exercise billed per 15-minute unit, targeting strength, endurance, range of motion, or flexibility with direct one-on-one patient contact.

97012 $14.36

Mechanical traction applied to one or more areas, usually the cervical or lumbar spine, as a supervised modality during therapy.

72100 $40.42

Radiologic examination of the lumbosacral spine capturing two or three views, used to evaluate the lumbar vertebrae and sacrum for injury, degeneration, or structural abnormality.

72110 $53.44

Radiologic examination of the lumbar spine (lumbosacral) with a minimum of four views, including oblique and/or bending views.

97530 $35.07

Dynamic, functional activities that use multiple parameters such as balance, strength, and range of motion together to improve real-world performance, billed in 15-minute units.

99213 $95.19

Established patient office or outpatient visit requiring 20–29 minutes of total time or low-complexity medical decision-making.

99214 $135.61

Office visit for an established patient requiring moderate-complexity medical decision making (MDM), or 30–39 minutes of total provider time on the date of service.

Common coding pitfalls

The recurring mistakes coders make with M99.83 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

Defaulting to M99.83 when M99.03 (segmental and somatic dysfunction of lumbar region) is better supported by the documentation — if the provider documents subluxation or segmental dysfunction, M99.03 is the correct pick.
Using M99.83 as a primary diagnosis on Medicare chiropractic claims without verifying the MAC's LCD requirements; many LCDs require an M99.0x subluxation code as the primary diagnosis for 98940-98942.
Coding M99.83 alongside a more specific lumbar diagnosis (e.g., M51.16, M47.816) without clinical justification — if the biomechanical lesion is the manifestation of the structural diagnosis, it should not be coded separately.
Mapping 'lumbosacral' biomechanical lesions to a sacral-region code (M99.84) — the ICD-10-CM Alphabetic Index routes both lumbar and lumbosacral to M99.83.
Omitting a pain or symptom secondary code when the patient's chief complaint is low back pain — M99.83 alone may not convey clinical complexity to the payer.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M99.83 sits under parent code M99.8 (Other biomechanical lesions) and is the lumbar-region-specific child code. Use it when the documented diagnosis describes a biomechanical dysfunction or lesion of the lumbar spine that is not a segmental/somatic dysfunction (M99.03), not a connective tissue stenosis (M99.23), not a disc-related lesion mapped elsewhere, and not a subluxation complex (M99.13). The ICD-10-CM Alphabetic Index maps both 'lumbar region' and 'lumbosacral' entries to M99.83, so a documented lumbosacral biomechanical lesion also resolves here.

This code appears most frequently in chiropractic, osteopathic, and physiatry billing when the treating provider documents a lumbar biomechanical finding that doesn't meet criteria for a segmental/somatic dysfunction code. It is also used in orthopedic and sports medicine contexts when imaging or clinical exam reveals lumbar mechanical abnormality without a more specific structural diagnosis. Because M99 codes are positioned at the end of Chapter 13, confirm no more specific M-code (e.g., M51.x for disc disorders, M47.x for spondylosis) better captures the documented condition before defaulting to M99.83.

For Medicare chiropractic claims, M99.0x codes (segmental and somatic dysfunction) are the preferred primary codes; M99.83 is appropriate only when the clinical documentation explicitly supports a biomechanical lesion that is distinct from subluxation or segmental dysfunction. Always pair M99.83 with any documented symptom codes (e.g., M54.5x for low back pain) as secondary diagnoses when those symptoms are not inherent to the biomechanical lesion itself.

Sibling codes

Other billable codes under M99.8 (laterality / anatomic variants).

M99.81

Other biomechanical lesions of cervical region

M99.82

Other biomechanical lesions of thoracic region

M99.89

Other biomechanical lesions of abdomen and other regions

M99.87

Other biomechanical lesions of upper extremity

M99.80

Other biomechanical lesions of head region

M99.88

Other biomechanical lesions of rib cage

M99.85

Other biomechanical lesions of pelvic region

M99.84

Other biomechanical lesions of sacral region

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01What is the difference between M99.83 and M99.03?

M99.03 (segmental and somatic dysfunction of lumbar region) is used when the provider documents subluxation or segmental/somatic dysfunction — the standard language in chiropractic and osteopathic notes. M99.83 applies when the documented finding is a biomechanical lesion that does not meet the definition of segmental/somatic dysfunction; it is the 'other' category for lumbar biomechanical pathology not captured by M99.03 or the other M99 subcategories.

02Can M99.83 be used as the primary diagnosis on a Medicare chiropractic claim?

Typically no. Most Medicare MACs require an M99.0x subluxation code as the primary diagnosis for chiropractic manipulation claims (98940-98942). Check the applicable LCD for your jurisdiction — some require M99.03 as primary with M99.83 as a secondary code, while others may not recognize M99.83 as supporting medical necessity for manipulation at all.

03Does M99.83 cover lumbosacral biomechanical lesions?

Yes. The ICD-10-CM Alphabetic Index maps both 'lumbar region' and 'lumbosacral' biomechanical lesions to M99.83. If the provider documents a lumbosacral biomechanical finding, M99.83 is the correct code — do not use M99.84 (sacral region) for lumbosacral involvement.

04Should I also code low back pain (M54.5x) when using M99.83?

Code the pain separately if it is documented as a complaint and is not inherent to the biomechanical lesion in the provider's documentation. Adding a secondary M54.5x code conveys clinical complexity and supports medical necessity, particularly for payers that audit single-code claims.

05When would M99.83 be preferred over a disc disorder code like M51.16?

Use M99.83 when the provider's documented diagnosis is a biomechanical dysfunction — not a structural disc pathology. If imaging confirms disc degeneration or herniation and the provider documents that as the diagnosis, M51.x codes are more specific and should take precedence. M99.83 is appropriate when the clinical finding is functional or movement-based without a structural disc diagnosis.

06Is M99.83 valid for FY2026?

Yes. M99.83 is an active, billable code in the FY2026 ICD-10-CM code set effective October 1, 2025. It has been billable continuously since ICD-10-CM implementation in 2015 with no description changes.

07Can M99.83 be used in orthopedic or sports medicine settings, or is it exclusively a chiropractic code?

M99.83 is not specialty-restricted. Orthopedic surgeons, physiatrists, sports medicine physicians, and physical therapists (in jurisdictions where they assign diagnosis codes) may use it when a lumbar biomechanical lesion is documented without a more specific structural diagnosis. However, orthopedic encounters more commonly yield specific M47.x or M51.x codes; M99.83 is appropriate only when those do not fit the documented findings.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira Scribe

Mira's AI scribe captures lumbar region specification, documented biomechanical findings (restricted mobility, asymmetric movement, manual exam results), the clinical rationale for not using a more specific lumbar code, and any lumbosacral involvement noted by the provider. This prevents downcoding to unspecified M99.9 or an audit flag from pairing M99.83 with a contradictory structural diagnosis already coded elsewhere in the encounter.

See how Mira captures M99.83 documentation