Pain localized to the muscles of mastication — primarily the masseter and temporalis — without joint involvement, classified under soft tissue disorders of the musculoskeletal system.
Verified May 8, 2026 · 6 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 7
- Region
- Other
Documentation tips
What should appear in the chart to support M79.11.
Source · Editorial brief grounded in 6 cited references ↓
- Name the specific muscle(s) involved — masseter, temporalis, or pterygoid — rather than writing 'jaw pain' or 'facial pain.'
- Explicitly document absence of TMJ joint involvement (no clicking, locking, or joint line tenderness) to justify a myogenous rather than articular code.
- Record findings from palpation: location of tenderness, reproduction of familiar pain, and any referred pain pattern to distinguish localized myalgia from myofascial pain syndrome.
- Note whether pain is provoked by mastication (chewing, clenching) to anchor it to the masticatory muscle group and support medical necessity.
- If imaging (MRI, panoramic X-ray) was performed, document the result — normal joint space and intact condyle support a myogenous diagnosis over an articular one.
Related CPT procedures
Procedure codes commonly billed with M79.11. Linking the right diagnosis to the right procedure is what establishes medical necessity.
Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis
Common coding pitfalls
The recurring mistakes coders make with M79.11 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Coding M79.11 and M79.7 (fibromyalgia) together on the same claim violates the Excludes1 rule at the M79.1 category level — payers will reject or deny.
- Defaulting to M79.10 (unspecified site) when the chart clearly identifies the masseter or temporalis — M79.11 is the correct specific code and M79.10 is likely to trigger a documentation query or downcoded reimbursement.
- Using M79.11 for TMJ pain with confirmed joint pathology — articular temporomandibular disorders belong in the M26.6x range, not the myalgia subcategory.
- Confusing M79.11 (mastication muscles) with M79.12 (auxiliary muscles of head and neck such as SCM and trapezius) — the clinical note must specify which muscle group is affected.
- Applying M79.11 when myositis (M60.-) is the documented diagnosis — Excludes1 prohibits concurrent coding with any M60.- code.
Clinical context
Source · Editorial summary grounded in 6 cited references ↓
M79.11 applies when a patient presents with dull, aching muscle pain confined to the masticatory muscles (masseter, temporalis, medial and lateral pterygoids) and the clinical record explicitly excludes joint pathology. The key distinction from temporomandibular joint (TMJ) disorder is that this code covers myogenous pain — muscle origin — not articular pain. If imaging or clinical exam implicates the TMJ joint itself, look to the M26.6x range instead.
M79.11 was introduced in FY2019 (effective October 1, 2018) when the non-specific parent code M79.1 was converted to a non-billable parent and four site-specific child codes were added. Before that split, all myalgia mapped to a single unclassified code. Today, if the documented pain is in cervical or head muscles other than the masticators, use M79.12. If the site is identifiable but outside those regions, use M79.18. Reserve M79.10 only when localization is genuinely undocumented.
Two Excludes1 restrictions apply at the M79.1 category level: fibromyalgia (M79.7) and myositis (M60.-) cannot be coded on the same claim as M79.11. If the clinical picture points to widespread pain meeting fibromyalgia criteria, M79.7 displaces M79.11 entirely. Psychogenic muscle pain maps to F45.8 or F45.41, not here.
Sibling codes
Other billable codes under M79.1 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 6 cited references ↓
01Can M79.11 be used for TMJ pain?
02What is the difference between M79.11 and M79.12?
03Why was M79.1 replaced, and does it still exist?
04Can M79.11 and fibromyalgia (M79.7) be coded together?
05Does M79.11 require a 7th character?
06What MS-DRG does M79.11 fall into?
07Is M79.11 appropriate when myositis is also documented?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M70-M79/M79-/M79.11
- 03aapc.comhttps://www.aapc.com/codes/coding-newsletters/my-orthopedic-coding-alert/icd-10-cm-update-code-set-for-2019-includes-expanded-myalgia-options-158113-article
- 04icdcodes.aihttps://icdcodes.ai/diagnosis/muscle-aches/documentation
- 05ostrowonline.usc.eduhttps://ostrowonline.usc.edu/masticatory-muscle-disorders/
- 06acupuncturetoday.comhttps://acupuncturetoday.com/article/33584-updates-to-icd10-specifically-for-myalgia-muscle-pain
Mira AI Scribe
Mira captures the specific muscle name (masseter, temporalis, pterygoid), provocation by chewing or clenching, palpation tenderness findings, and explicit absence of TMJ joint signs from the encounter note. That detail locks in M79.11 over the unspecified M79.10, prevents a cross-code conflict with M79.7 or M60.-, and gives the payer clinical justification for any associated therapeutic procedures.
See how Mira captures M79.11 documentation