ICD-10-CM · Hand

M65.30

M65.30 classifies stenosing tenosynovitis (trigger finger) of a digit that is not identified by name or laterality in the clinical documentation. Use it only when the specific finger and side are genuinely undocumented.

Verified May 8, 2026 · 5 sources ↓

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

Drawn from CDCICD10DataCMSAAPC

Documentation tips

What should appear in the chart to support M65.30.

Source · Editorial brief grounded in 5 cited references ↓

Name the specific finger (thumb, index, middle, ring, little) and laterality (right or left) in every encounter note — this single step unlocks a more specific billable code and closes the door on M65.30.
Document the clinical finding that confirms trigger finger: locking or catching in flexion, a palpable nodule at the A1 pulley, or crepitus on range of motion.
Record whether the condition is primary/acquired or secondary to a systemic condition (e.g., rheumatoid arthritis, diabetes) — secondary etiology may require an additional code.
If multiple fingers are affected, document each digit and side individually; code each separately rather than defaulting to M65.30 as a catch-all.
For injection encounters, tie the injection site explicitly to the documented finger — the procedure code (20550) is finger-level and the diagnosis should match.

Related CPT procedures

Procedure codes commonly billed with M65.30. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

26055 $629.61

Surgical incision of a finger tendon sheath to release constriction, most commonly performed for trigger finger (stenosing tenosynovitis).

20550 $60.46

Injection into a single tendon sheath, ligament, or aponeurosis (such as the plantar fascia) — one anatomical site per unit.

20551 $60.46

Injection of a therapeutic substance into the origin or insertion point of a single tendon, used to treat tendinitis, enthesopathy, or localized inflammation at the bone-tendon junction.

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.

97140 $27.72

Skilled, hands-on manual therapy techniques — including joint mobilization/manipulation, manual lymphatic drainage, and manual traction — applied to one or more body regions, billed per 15-minute unit.

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.

99203 $117.57

New patient office or outpatient visit requiring a medically appropriate history and/or examination with low-complexity medical decision-making, or 30–44 minutes of total provider time on the date of the encounter.

99204 $177.36

New patient office or outpatient visit requiring moderate medical decision making, or 45–59 minutes of total provider time on the date of the encounter.

73140 $39.41

Radiologic examination of one or more fingers, requiring a minimum of two views.

Common coding pitfalls

The recurring mistakes coders make with M65.30 and adjacent codes.

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

Using M65.30 when the provider's note clearly names the finger and side — if the chart says 'right ring finger,' the correct code is M65.341, not M65.30.
Billing M65.30 with a finger-specific procedure code (e.g., 26055 with modifier RT or LT) creates a laterality mismatch that payers flag as a diagnosis-procedure incompatibility.
Confusing M65.30 (trigger finger, unspecified digit) with M65.319 (trigger thumb, unspecified side) or M65.329 (trigger index finger, unspecified side) — each is a distinct code when the digit is known but the side is not.
Failing to update M65.30 at follow-up once the provider has clearly documented the affected finger in the medical record — leaving an unspecified code on recurring claims signals incomplete documentation to auditors.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M65.30 is the fallback code within the M65.3 trigger finger family. The condition involves thickening or nodule formation at the A1 pulley that causes the flexor tendon to catch or lock during digital motion. The parent category M65.3 is non-billable; M65.30 is the only billable option when neither the finger nor the side is specified.

The code hierarchy breaks down by digit first, then laterality. Thumb codes live under M65.31 (right M65.311, left M65.312, unspecified M65.319). Index finger: M65.32x. Middle: M65.33x. Ring: M65.34x. Little: M65.35x. Each digit subcategory uses a 6th character of 1 (right), 2 (left), or 9 (unspecified side). M65.30 sits above all of these — use it only when the note fails to identify any specific digit at all, which should be rare in a face-to-face orthopedic encounter.

Payers and CMS home health LCDs (e.g., L34428) expect finger- and side-specific codes. Submitting M65.30 when a more specific code is supportable invites medical necessity denials and audit scrutiny, particularly for procedure codes like 26055 (tendon sheath incision) or corticosteroid injection 20550, which are finger-level interventions.

Frequently asked questions

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

01When is M65.30 actually appropriate to use?

M65.30 is appropriate only when the clinical note documents trigger finger but does not identify the specific digit or the hand affected. In practice, this is uncommon in an orthopedic or hand surgery setting — it is more defensible as a temporary code on an initial triage note pending full evaluation.

02What is the correct code if the provider documents 'trigger finger, right ring finger'?

Use M65.341 — trigger finger, right ring finger. The 6th character '1' denotes the right side. M65.30 would be incorrect and overly unspecified.

03Can M65.30 be used for bilateral trigger finger?

The approximate synonyms list includes 'bilateral trigger finger,' but best practice is to code each affected digit separately with the appropriate laterality-specific code (e.g., M65.341 for right ring and M65.342 for left ring) rather than collapsing both into M65.30.

04What CPT codes are commonly billed with trigger finger diagnoses?

Common pairings include 26055 (tendon sheath incision for trigger finger release), 20550 (injection into a tendon sheath), 97110 and 97140 for therapeutic exercise and manual therapy in rehab, and 99213–99214 for office evaluation and management visits.

05Does M65.30 require a 7th character?

No. M65.30 is an M-code (musculoskeletal chapter) and does not use 7th-character extensions. The A/D/S encounter extension convention applies to injury S-codes, not to this code.

06What MS-DRGs does M65.30 map to for inpatient claims?

M65.30 groups to MS-DRG 557 (Tendonitis, myositis and bursitis with MCC) or 558 (without MCC) under MS-DRG v43.0, per the ICD-10-CM tabular data.

07Is trigger finger coded differently when it is secondary to rheumatoid arthritis or diabetes?

Yes. When trigger finger is a manifestation of an underlying systemic condition, code the underlying disease first per the 'code first' convention, then add the M65.3xx code. Confirm the causal relationship is explicitly documented by the provider.

Sources & references

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

01CDC ICD-10-CM Tabular List 2026 (effective October 1, 2025)
02
icd10data.com
https://www.icd10data.com/ICD10CM/Codes/M00-M99/M65-M67/M65-/M65.30
03
cms.gov
https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=53057&ver=67&LCDId=34560&Date=&DocID=L34428
04
cms.gov
https://www.cms.gov/files/document/fy-2025-icd-10-cm-coding-guidelines.pdf
05
aapc.com
https://www.aapc.com/codes/icd-10-codes/M65.30

Mira AI Scribe

Mira's AI scribe captures the finger name, hand (right or left), the presence of locking or catching in flexion, any palpable A1 pulley nodule, and prior conservative care (splinting, injections) from the encounter narrative. That specificity drives selection of a digit- and laterality-specific M65.3xx code, preventing the fallback to M65.30 (unspecified finger) that draws payer medical necessity denials and downcoded reimbursement.

See how Mira captures M65.30 documentation