ICD code S42.199A – Fracture of other part of scapula, unspecified shoulder

Key takeaways

S42.199A codes a closed fracture of a named scapula part outside the body, acromion, coracoid, glenoid and neck, with the side undocumented.

When the record names the side, S42.191A (right) or S42.192A (left) is the more specific code.

When the record never says which part of the scapula broke, S42.109A fits instead of S42.199A.

Character A covers every visit during active treatment of a closed fracture, and an open fracture takes B.

Pabau’s claims management pre-fills the claim from the patient record and checks required fields before sending, so there’s no double entry.

What ICD-10 code S42.199A covers

ICD-10 code S42.199A reports a closed fracture of other part of the scapula, unspecified shoulder, at the initial encounter.

In plain terms, imaging has placed the break on a named part of the shoulder blade that has no subcategory of its own. The record also doesn’t say which side. It’s a billable code in the current CMS ICD-10-CM code set and is valid on professional and institutional claims.

Where S42.199A sits in the code tree

S42.199A is a seven-character code, and each level narrows the injury. The chain runs from S42 (shoulder and upper arm) to S42.1 (scapula). From there it moves to S42.19 (other part of scapula) and S42.199 (unspecified shoulder). Check the current hierarchy in the CDC ICD-10-CM web tool before you finalize a code.

Other part and unspecified part lead to different codes

The words “other” and “unspecified” send you to different subcategories. “Other part” means the record names a scapular site that has no code of its own. “Unspecified part” means the record says the scapula is broken but never says where.

So when the imaging report reads “scapular fracture” and nothing more, S42.109A is the right code. Once the radiologist names the glenoid or the acromion, move to that subcategory and its displacement choice. An open, displaced glenoid fracture with no side documented, for example, codes to S42.143B.

S42.19- itself has no displaced or nondisplaced option, so the S42 default to displaced has nothing to act on here. The path below runs the three questions that decide whether S42.199A fits.

Seven 7th characters track the episode of care

The 7th character follows the episode of care. Under Section I.C.19.a of the ICD-10-CM Official Guidelines, “initial encounter” covers every visit while the patient receives active treatment. The S42 category allows seven characters, and S42.199 accepts all of them.

A and B split on open versus closed. Under the S42 category note, a fracture not documented as open or closed defaults to closed, so A is the fallback at the first encounter.

Four guidelines shape every S42.199A claim

Section I.C.19.c of the ICD-10-CM Official Guidelines governs traumatic fracture coding, including S42.199A. Meeting billing compliance requirements on these claims comes down to four rules.

• Traumatic vs pathological: S42.199A is for fractures caused by injury. When the physician links the fracture to osteoporosis, a tumor or another bone disease, use M80.- or M84.- instead.
• Open vs closed: Code the fracture as closed unless the record documents it as open. An open fracture of the same site takes S42.199B at the initial encounter.
• Laterality: Under Section I.B.13, code the documented side. The unspecified-shoulder code is for records that don’t identify the side at all.
• Associated injuries: Scapular fractures usually follow high-energy trauma, so code each documented injury, such as rib fractures (S22.3-, S22.4-) or a traumatic pneumothorax (S27.0-). The most serious injury, as determined by the provider, goes first.

The record needs five details to support S42.199A

A claim built on S42.199A has to survive an audit, so the chart must back each part of the code. Submitting a clean claim for a scapula fracture depends on five details in the record.

• Imaging confirmation: An X-ray or CT report confirming the fracture and naming the part of the scapula involved.
• The named part: Wording that places the fracture outside the body, acromion, coracoid, glenoid and neck. Without it, S42.109A or a named-part code fits better.
• Mechanism of injury: A note on how the injury happened, such as a collision, a fall from height or a direct blow.
• Open or closed status: A statement that the skin is intact, or a description of an open wound over the fracture.
• Encounter status and side: Notes showing active treatment for character A, plus a provider query on file if the side stays undocumented.

Scapula CPT codes pair with S42.199A, not humerus codes

Scapula fractures are treated and billed with scapula-specific CPT codes. Humerus codes such as 23600 and 23615 describe a different bone and don’t belong on an S42.199A claim.

In Pabau, the practice software we build, the Claim.MD integration can handle real-time eligibility checks and electronic CMS-1500 claim submission. With its claims management software, Pabau pre-fills the claim from the invoice and patient record and sends it through your clearinghouse.

Check each pair against current NCCI edits before submission. The first sling or strapping is part of 23570 or 23575, so it isn’t billed as a separate application code.

“Open treatment” in 23585 describes the surgery, not the wound, so it can pair with S42.199A when a closed fracture is fixed surgically. Review your superbill documentation to confirm the CPT code matches the treatment delivered.

Payer rules change by plan and program

Traditional Medicare fee-for-service generally doesn’t require prior authorization for closed fracture care. Medicare Advantage plans set their own rules, so check the specific plan. Physical therapy for shoulder rehabilitation may need separate authorization with any payer.

• Medicare: Local coverage policies may expect imaging findings, the mechanism of injury and a clinical reason for the procedure billed.
• Workers’ compensation: State programs often ask for external cause codes and employer incident details. Some states also require their own form alongside the CMS-1500.
• Commercial payers: Authorization rules for open treatment (23585) vary widely. Check the plan’s surgical authorization list before scheduling.
• Medicaid: Each state sets its own prior authorization rules for fracture care, so check the state provider manual first.

External cause codes add the mechanism of injury

External cause codes report how, where and during what activity the injury happened. They are never principal diagnoses, so list them after S42.199A.

Section I.C.20 of the guidelines encourages external cause reporting, but there is no national mandate. They become required only where a state reporting mandate or a payer says so. Mapping your medical billing workflows by payer shows which claims need them.

Six errors behind S42.199A denials

Claims for S42.199A fail for predictable reasons. A strong denial management workflow catches most of them before submission.

• Wrong 7th character: Using S42.199D while the patient is still in active treatment, or A after active treatment has ended.
• Unspecified side with a documented side: Reporting S42.199A when the imaging report names the right or left shoulder.
• Wrong subcategory: Choosing S42.199A when the record names the glenoid, acromion or another coded part, or names no part at all.
• Bone mix-up: Pairing S42.199A with proximal humerus CPT codes such as 23600 or 23615.
• Missing external cause code: Leaving out the V, W or Y code where a payer or state mandate requires one.
• Traumatic code for a pathological fracture: Using S42.199A when the physician attributes the fracture to bone disease rather than injury.

Excludes notes and look-alike codes to rule out

S42.199A inherits its Excludes notes from category S42, so it does carry an Excludes1 note. Traumatic amputation of the shoulder and upper arm (S48.-) is Excludes1. A periprosthetic fracture around an internal prosthetic shoulder joint (M97.3-) is Excludes2. Confirm the current notes in the AAPC ICD-10-CM lookup before you finalize the code.

• S48.- (Excludes1): A traumatic amputation at shoulder or upper arm level is coded in S48.-, never alongside S42.199A for the same injury.
• M97.3- (Excludes2): A fracture around a shoulder replacement is coded in M97.3-. Both codes appear together only when a separate scapula fracture is also documented.
• S42.10-: Fracture of unspecified part of scapula. Use it when the record never names the part.
• S42.11- to S42.15-: The body, acromion, coracoid, glenoid and neck. Each has its own codes with a displacement choice.
• S42.0- and S42.2-: The clavicle and the proximal humerus. Both sit in category S42 but are separate bones with their own subcategories.
• M80.- and M84.-: Osteoporotic and other pathological fractures. When the physician documents a disease cause, these replace S42.199A.

How Pabau keeps S42.199A claims complete before they leave

Scapula fracture claims often start in a busy emergency department or orthopedic practice. The coder pieces the claim together from imaging, notes and a superbill. A missed side, a wrong 7th character or a blank authorization field can send it back weeks later.

Pabau pre-fills the CMS-1500 from the patient record instead. Invoice, patient and insurer details from the record pre-fill the claim, so there’s no double entry.

Before a claim can be sent, Pabau checks that required fields such as membership numbers and authorization codes are complete. In the US, the Claim.MD integration adds real-time eligibility checks, claim-status tracking and ERA remittance posting. Your team spends less time reworking returned claims and more time on the next encounter.

Send complete fracture claims with Pabau

Pabau pre-fills claims from the patient record and checks required fields before sending, so the claim reaches payers with the required details in place. Real-time eligibility checks run through Claim.MD.

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Conclusion

S42.199A is a narrow code, and it earns its place only when three facts line up. The fracture is closed, it sits on a scapular part with no subcategory of its own, and the record never names the side. When any of those changes, a more specific code exists and payers expect you to use it.

Treat an S42.199A claim as a prompt to query rather than a default. One question to the radiologist or treating physician about the side or the exact site often turns an unspecified code into a specific one.

Book a demo to see how Pabau pre-fills each fracture claim from the patient record so it reaches payers with the required details in place.

Continue your research

Need a clean-claim checklist for injury codes? Clean claim requirements covers the fields and documentation every payer expects before processing an injury diagnosis claim.

Want to understand denial patterns across your practice? Denial management in healthcare outlines how to categorize, track, and appeal denied claims by root cause.

Looking for the broader revenue cycle picture? Revenue cycle management explained walks through each stage from eligibility verification to payment posting.

Coding a named scapula part instead? ICD-10 code S42.143B covers an open, displaced glenoid fracture when the side isn’t documented.

Looking up a neighboring injury code? ICD-10-CM codes collects the diagnosis code guides by chapter.

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