Lumbar region is coded as which option?

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In this coding area, the region of the spine is identified by the decimal portion of the M99 code. The M99.0x group covers spine-related disorders, and the digit after the decimal specifies the region. For the lumbar region, the ending is 03, giving M99.03. That’s why this option is the best fit—it precisely denotes the lumbar area. The other endings correspond to different spinal regions, so they wouldn’t describe the lumbar region.