Glossary · Anatomy

Vertebral body

The vertebral body is the thick, cylindrical anterior portion of a vertebra that bears axial load and forms the bony borders of the spinal canal. It is the structural unit referenced in CPT and ICD-10-CM codes for fracture treatment, augmentation, and corpectomy procedures.

Verified May 8, 2026 · 7 sources ↓

Drawn from CMSAAPCSrsMedcentral

Definition

Source · Editorial summary grounded in 7 cited references ↓

Each vertebra consists of two main regions: the posterior arch (pedicles, laminae, and processes) and the anterior vertebral body. The body is a roughly cylindrical block of cancellous bone enclosed by a cortical shell. Stacked vertically, vertebral bodies transmit the compressive forces of body weight down the spinal column, with intervertebral discs seated between adjacent bodies acting as shock absorbers. The size and shape of bodies change across spinal regions—cervical bodies are smallest, thoracic bodies are intermediate, and lumbar bodies are the largest, reflecting the increasing load each level must bear.

From a coding standpoint, the vertebral body is the unit of count. CPT descriptors for vertebroplasty, kyphoplasty, and corpectomy are written 'per vertebral body,' meaning a procedure performed at three levels requires three units or the primary code plus the appropriate add-on(s). ICD-10-CM fracture codes also map to the body itself: a vertebral compression fracture (VCF) occurs when the anterior body collapses under compressive load, which is distinct from a posterior element fracture and drives entirely different code selection.

Osteoporosis is the leading cause of VCFs. Pathological fractures through the vertebral body due to age-related or secondary osteoporosis are reported with M80-series codes, while traumatic fractures use S-series codes requiring documentation of type (burst, wedge, compression), encounter (initial, subsequent, sequelae), and—for open fractures—Gustilo classification equivalent. The specificity demanded by ICD-10-CM for vertebral body fractures directly affects medical necessity determinations for augmentation procedures such as kyphoplasty and vertebroplasty.

Why it matters

Payers and CMS auditors count vertebral bodies as the billing unit for augmentation and corpectomy codes (e.g., 22513–22515, 63087). Under-counting bodies means lost reimbursement; over-counting invites upcoding scrutiny. CMS's 2022 fee-for-service audit flagged more than $99 million in improper spinal fusion payments, with incorrect coding and insufficient documentation as leading causes. Correctly identifying and documenting the number of affected vertebral bodies—and capturing fracture specifics such as pathological vs. traumatic origin, healing status, and spinal region—directly determines which ICD-10-CM codes support medical necessity for augmentation, fusion, or closed fracture treatment, reducing denial risk and audit exposure.

Common mistakes

Where people most often go wrong with this concept.

Source · Editorial brief grounded in cited references ↓

Counting intervertebral disc spaces instead of vertebral bodies when tallying units for kyphoplasty or vertebroplasty add-on codes (22515), which leads to incorrect unit reporting.
Reporting vertebral body compression fractures with a generic back-pain ICD-10-CM code instead of an M80- or S-series fracture code, causing medical necessity denials for augmentation procedures.
Failing to distinguish pathological fracture (M80.08XA) from traumatic fracture (S-series) when the mechanism is ambiguous—payer criteria for kyphoplasty coverage require the osteoporotic/pathological fracture codes specifically.
Omitting the encounter qualifier (initial 'A', subsequent 'D', or sequela 'S') on vertebral body fracture codes, which results in claim rejections or requests for additional documentation.
Applying modifier 50 (bilateral) to per-vertebral-body CPT codes such as 22513–22515; CMS guidance states these descriptors are inherently unilateral or bilateral per body and do not require modifier 50.

Related codes

Codes commonly involved when this concept appears in practice.

CPT

Modifiers

51 Multiple procedures 62 Two surgeons 59 Distinct procedural service

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01Why are vertebral body augmentation CPT codes billed per body rather than per side?

CMS guidance specifies that CPT codes 22510–22515 describe procedures performed on one vertebral body, unilateral or bilateral. Because the vertebral body is a midline structure, laterality does not apply; the count unit is the body itself. Modifier 50 and LT/RT modifiers are explicitly excluded for these codes.

02What is the difference between a vertebral body compression fracture and a burst fracture for coding purposes?

A compression fracture involves failure of the anterior vertebral body under axial load, typically collapsing the front wall. A burst fracture involves failure of both anterior and posterior walls, with potential retropulsion of bony fragments into the spinal canal. Both use S-series ICD-10-CM codes for traumatic episodes, but the fracture pattern must be documented because it affects surgical planning, medical necessity criteria, and sometimes DRG assignment for inpatient stays.

03Can a generic 'back pain' diagnosis code support a kyphoplasty claim?

No. CMS requires a documented vertebral fracture code—specifically from the M80 (pathological/osteoporotic) series for percutaneous vertebral augmentation to meet medical necessity criteria. A nonspecific pain code will result in a medical necessity denial. The operative and clinic notes must clearly establish the fracture diagnosis and its osteoporotic or pathological origin.

04How does the vertebral body relate to corpectomy coding?

Corpectomy (vertebral body resection, partial or complete) is coded per vertebral segment resected. CPT 63087 covers the primary lumbar segment via a combined thoracolumbar approach; each additional segment requires a separate add-on code. Documentation must state how many bodies were resected and the specific spinal levels to support each billed unit.

05When should a vertebral body fracture be coded as a sequela versus a subsequent encounter?

Subsequent encounter (suffix D, G, K, or P) applies while the patient is still receiving active treatment for the fracture—including follow-up visits, physical therapy, and hardware checks. Sequela (suffix S) is used only after healing is complete and the patient presents with a late effect directly caused by the fracture, such as chronic kyphotic deformity or persistent neurological deficit. Misusing 'S' during active care is a common audit finding.

Sources & references

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

Mira AI Scribe

When Mira detects documentation referencing a vertebral body fracture or augmentation procedure, it flags the following for the coder's review: 1. BODY COUNT: Confirm the exact number of vertebral bodies treated. Each body maps to a separate CPT unit or add-on code. Ambiguous language such as 'treated the fracture level' without a named vertebra will prevent accurate unit assignment. 2. FRACTURE ETIOLOGY: Mira distinguishes osteoporotic/pathological fractures (M80-series) from traumatic fractures (S-series) based on documented mechanism and underlying bone disease. If osteoporosis is listed in the problem list but the note attributes the fracture to trauma, Mira will surface both options and prompt the provider to clarify. 3. ENCOUNTER TYPE: The note must include whether this is an initial encounter (A), subsequent encounter with routine healing (D), subsequent with delayed healing (G), subsequent with malunion (P), subsequent with nonunion (K), or sequela (S). Mira will auto-suggest the encounter suffix but will not auto-confirm without explicit documentation. 4. MODIFIER LOGIC: For vertebral augmentation codes (22513–22515), Mira suppresses modifier 50 and flags any attempt to append LT/RT, consistent with CMS billing guidance that these codes are per-body descriptors. If multiple levels are treated, Mira prompts addition of 22515 for each additional thoracic or lumbar body. 5. MEDICAL NECESSITY LINKAGE: Mira cross-checks that the assigned ICD-10-CM fracture code appears on the CMS-published list of codes supporting medical necessity for the billed PVA procedure before the claim is submitted.

See Mira's approach

Related terms

Kyphoplasty Clinical

Kyphoplasty is a minimally invasive percutaneous vertebral augmentation procedure in which a mechanical device creates a cavity inside a fractured vertebral body before bone cement is injected—distinguishing it from vertebroplasty, which skips the cavity-creation step.

Vertebroplasty Clinical

Vertebroplasty is a minimally invasive, image-guided procedure in which bone cement (typically polymethyl methacrylate, PMMA) is injected percutaneously into a fractured vertebral body to stabilize the fracture and reduce pain. It is distinct from kyphoplasty, which first creates a cavity with an inflatable balloon before cement injection.

Intervertebral disc Anatomy

The intervertebral disc is a fibrocartilaginous structure situated between adjacent vertebral bodies, composed of a gel-like nucleus pulposus surrounded by a tough annulus fibrosus, functioning as the spine's primary shock absorber and load distributor.

Pedicle Anatomy

A pedicle is the short, thick bony bridge projecting posteriorly from each side of a vertebral body that connects the body to the posterior arch. Each vertebra has two pedicles—one on the left and one on the right—forming the lateral walls of the spinal canal.