ICD-10 code S72.036E: Nondisplaced midcervical femoral neck fracture

Key takeaways

ICD-10 code S72.036E covers a nondisplaced midcervical fracture of an unspecified femur. It applies at a subsequent encounter with routine healing.

The 7th character E marks a follow-up visit after active treatment ends. It applies only to Gustilo type I or II open fractures.

Laterality sits in character 6, not in the 7th character. Use S72.034E for the right femur and S72.035E for the left.

The S72.036 base code accepts 16 valid 7th characters. They run from A to S, skipping I, L and O.

Practice management software like Pabau keeps Gustilo type, encounter status and laterality in structured fields. Coders then see all three before the claim goes out.

ICD-10 code S72.036E is a billable ICD-10-CM code for a nondisplaced midcervical fracture of an unspecified femur. It applies at a subsequent encounter, once the open fracture wound has been classified as Gustilo type I or II and healing is routine. The 7th character E carries both of those facts at once.

This reference works through the code structure and all 16 valid 7th characters. It also covers the Gustilo classification, laterality rules, companion codes, and the errors that most often trigger denials.

ICD-10 code S72.036E: Definition and billable status

ICD-10 code S72.036E is a billable ICD-10-CM diagnosis code. Its full official descriptor is: Nondisplaced midcervical fracture of unspecified femur, subsequent encounter for open fracture type I or II with routine healing.

The code is valid in the current FY2026 ICD-10-CM code set. ICD-10-CM is updated every October 1, so confirm validity for the fiscal year you are billing.

Coders can check current-year validity through the CDC/NCHS ICD-10-CM web tool. The table below summarizes the key facts a coder or biller needs at a glance:

Breaking down the S72.036E code structure

Each character in an ICD-10-CM code carries specific meaning. Reading them in order is what prevents the most common assignment errors. Here is what S72.036E communicates character by character:

Character 6 does double duty in this subcategory. It carries displacement status and laterality together, rather than laterality on its own. Within S72.03, the digits 1, 2 and 3 cover displaced fractures of the right, left and unspecified femur. The digits 4, 5 and 6 cover nondisplaced fractures in the same order.

So S72.034 is nondisplaced on the right, S72.035 nondisplaced on the left, and S72.036 nondisplaced with the side unspecified. Coders new to the S72 block often expect a separate laterality digit and pick a displaced code by mistake.

What the 7th character E means

The 7th character is the highest-stakes element in fracture coding. It governs the episode of care and the type of fracture wound, which are two separate clinical facts packed into one character. Misassigning it is the top reason orthopedic and physical therapy practices receive fracture-related claim denials.

The S72.036 base code takes 16 valid 7th characters. Here is the full set:

Three letters are missing from that run. ICD-10-CM leaves out I and O wherever it assigns characters, because both read too easily as digits. The letter L is not used in this extension set.

Sixteen characters is not a universal count. Physeal fracture codes such as S49.109P take a shorter extension set, so never carry a 7th character across from one subcategory to another.

For S72.036E specifically, the patient has left the active treatment phase. The original fracture was an open wound classified as Gustilo type I or type II. The current visit is a follow-up, typically a post-surgical check, physical therapy review, or imaging appointment. Healing is progressing without complications.

Delayed healing moves the code to character H instead. Character M covers a fracture that has failed to unite. Character Q covers one that united in an abnormal position. A subsequent encounter begins once active surgical or procedural treatment concludes, not simply because the emergency visit is over.

Gustilo open fracture classification and ICD-10 code selection

The Gustilo-Anderson classification system determines which 7th character extension applies to an open fracture. Coders cannot assign a Gustilo type. The treating physician or surgeon has to document it explicitly. Without that documentation, the code defaults to an unspecified open fracture type, which many payers reject.

Gustilo-Anderson sorts open fractures by wound size and the extent of soft tissue damage:

• Type I — clean wound under 1 cm, minimal soft tissue damage, low-energy mechanism
• Type II — wound 1 to 10 cm, moderate soft tissue damage, no flap required
• Type IIIA — wound over 10 cm with extensive damage, but adequate soft tissue coverage
• Type IIIB — extensive soft tissue damage with periosteal stripping, soft tissue flap required
• Type IIIC — open fracture with an arterial injury that requires repair

ICD-10-CM does not give each type III subtype its own letter. Types IIIA, IIIB and IIIC share a single character at every healing stage, and types I and II share another. The table below maps each combination for the S72 block:

S72.036E applies only to Gustilo type I and type II open fractures at a subsequent encounter with routine healing. A type III open fracture of the same site at the same stage takes S72.036F, whichever subtype was documented.

Correct Gustilo documentation in the operative note or wound assessment is the foundation for compliant coding. Practices managing clinical documentation at scale need clear physician-to-coder pathways, so the Gustilo type reaches the chart before the claim is filed.

Clinical description: Nondisplaced midcervical femoral neck fracture

The midcervical region sits in the middle of the femoral neck. It lies between the subcapital zone, just below the femoral head, and the basicervical zone at the base. Fractures at that base take the S72.04 subcategory instead, including S72.041B.

Nondisplaced means the bone has fractured but the fragments remain in anatomical alignment. That distinction matters clinically. Displaced fractures carry a much higher risk of avascular necrosis, and they often require total hip arthroplasty rather than internal fixation.

Clinically, nondisplaced midcervical femoral neck fractures most commonly occur in two populations:

• Elderly patients with osteopenia or osteoporosis after low-energy falls. W-codes for falls are almost always reported as secondary external cause codes.
• Young adults after high-energy trauma, such as a motor vehicle collision or a sports injury. These fractures present as open wounds more often, which makes 7th character selection more consequential.

Treatment at the initial encounter usually involves orthopedic surgical fixation. Nondisplaced fractures with preserved blood supply are typically fixed internally, with cannulated screws or a dynamic hip screw.

The subsequent encounter phase captured by S72.036E covers the post-operative period. That includes wound checks, imaging reviews, physical therapy referrals, and rehabilitation monitoring. Orthopedic and sports medicine practices carry most of these visits, and each one needs the Gustilo type and healing status recorded.

When to use S72.036E vs related S72.036 codes

S72.036E is one of 16 possible 7th character extensions for the S72.036 base code. Choosing the wrong one is the most direct path to a denied claim. The decision is straightforward when the physician’s documentation is complete:

1. Is the patient still receiving active treatment? Use A for a closed fracture, B for open type I or II, or C for open type IIIA, IIIB or IIIC.
2. Is this a follow-up with routine healing? Use D for closed, E for open type I or II, or F for open type IIIA, IIIB or IIIC.
3. Is healing delayed rather than routine? Use G for closed, H for open type I or II, or J for open type IIIA, IIIB or IIIC.
4. Has the fracture failed to unite? Use K for closed, M for open type I or II, or N for open type IIIA, IIIB or IIIC.
5. Did it unite in an abnormal position? Use P for closed, Q for open type I or II, or R for open type IIIA, IIIB or IIIC.
6. Are you coding a late effect of the fracture rather than the fracture itself? Use S for sequela.

S72.036E is appropriate only when five conditions hold together:

• the fracture is nondisplaced
• the anatomy is the midcervical femoral neck
• the encounter is a subsequent one, not an initial one
• the documented wound is a Gustilo type I or type II open fracture
• healing is routine, rather than delayed or complicated

Any deviation shifts the code. Practices that invest in structured claims management workflows can build decision-support logic for this. That logic flags encounters carrying open fracture codes and prompts for Gustilo documentation before submission.

Additional codes to report with S72.036E

ICD-10-CM guidelines (Section I.C.20) recommend reporting external cause codes as secondary codes whenever an injury code is the principal diagnosis. For hip fracture coding, that means:

• W-codes for falls — W01, W18 and W19. They cover a fall from slipping or tripping, another fall on the same level, and an unspecified fall. These are the most common companions to femoral neck fracture codes in elderly patients.
• Activity and place of occurrence codes — Y93 for activity and Y92 for place of occurrence. Both give context that payers increasingly expect.
• External cause status code — Y99.8, other external cause status, for injuries that are not work-related.

Some payers treat external cause codes as mandatory. Others accept them as supplementary. Medicare and Medicaid generally follow CMS guidance, which designates them as secondary but recommended.

Confirm payer-specific requirements before you submit. A billing review stage is the natural place for that check, and medical billing compliance rules define what the payer can ask for. The AAPC ICD-10-CM code lookup gives crosswalk context for identifying companion codes.

Laterality is the other point payers check closely. S72.036E does not name which femur is affected, so a payer may query or reject the claim without documented justification for the unspecified side.

If the operative report names the right or left femur, use S72.034E or S72.035E instead. Document the reason for unspecified laterality in the medical record when it genuinely applies.

S72.036E in medical billing: Payer guidance and claim requirements

S72.036E is accepted by Medicare and Medicaid as a valid ICD-10-CM diagnosis code under HIPAA electronic transaction standards. Most commercial payers follow the same acceptance criteria. Code validity alone does not make the claim payable. It also takes documentation that lines up across four points:

• Physician note confirms a subsequent encounter — the visit clearly follows active treatment, with no new surgical intervention planned or performed.
• Gustilo type documented — the original operative or wound assessment note names the classification, either I, II, or a type III subtype.
• Healing status documented — routine, delayed, nonunion, or malunion, since each one carries a different 7th character.
• Laterality resolved or justified — right, left, or unspecified with a documented reason.

A clean claim on this code depends on all four holding at once. Three denial triggers account for most rejected S72.036E claims. The first is using an initial encounter character, A, B or C, on a follow-up visit.

The second is a Gustilo type that does not match between the initial and subsequent encounter codes. The third is submitting without external cause codes when the payer requires them. Reading the denial codes on the remittance advice tells you which of the three applied.

Practices reduce these denials by building structured patient care management protocols. Those protocols capture Gustilo type at the original encounter and carry it forward into every subsequent visit record.

ICD-10-CM coding guidelines for fracture subsequent encounters

ICD-10-CM Official Guidelines Section I.C.19.c governs traumatic fracture coding. These are the definitions to internalize:

• Active treatment — the patient is receiving definitive surgical or procedural treatment for the fracture. This is the initial encounter phase, however many visits it takes.
• Subsequent encounter — active treatment has concluded and the patient is in aftercare, healing monitoring, or rehabilitation. Characters D through R cover this phase.
• Routine healing — the fracture is healing as expected. Characters D, E and F apply, for closed, open type I or II, and open type IIIA to IIIC respectively.
• Delayed healing — healing is progressing, but slower than expected. Characters G, H and J cover this, in the same closed, type I-II, type III order.
• Nonunion — the fracture has failed to unite. Characters K, M and N apply.
• Malunion — the fracture united in an abnormal position. Characters P, Q and R apply.
• Sequela — the acute phase is over and you are coding a late effect of the fracture. Character S applies.

The guidelines add one practical clarification. A subsequent encounter is not simply the second or third visit. A patient can have several initial encounters when active treatment continues across multiple visits. Equally, a single post-operative check counts as a subsequent encounter once the procedure that constituted active treatment is complete.

The ResDAC ICD-10-CM coding reference adds context on how these definitions appear in Medicare claims data.

Practices handling high volumes of orthopedic follow-up visits often validate 7th character selection inside the EHR workflow, before the claim is generated. Tying the encounter-type decision to the scheduling workflow helps too. When follow-up appointments are pre-tagged as subsequent encounters, the billing team has less to review by hand.

Common coding errors to avoid with S72.036E

These are the errors that appear most often in orthopedic fracture coding audits, and each one has a direct fix:

• Using 7th character A, B or C on a follow-up visit — the most common error. Active treatment ended at surgery or at the last procedural intervention. Every post-operative visit is a subsequent encounter unless a new surgical procedure happens at that visit.
• Confusing the displaced and nondisplaced digits — S72.033E is the displaced midcervical fracture of an unspecified femur. The nondisplaced version is S72.036E. Both sit in the same subcategory, so it is easy to reach for the wrong digit when the note only says “unspecified side.”
• Reading F as the type I or II character — F covers Gustilo type IIIA, IIIB or IIIC with routine healing. Type I or II with routine healing is E. This single-letter slip changes the severity the claim reports.
• Assigning a Gustilo type without physician documentation — coders cannot assign the classification themselves. If the operative note says “open fracture” with no type, query the physician before filing. Submitting an assumed type risks upcoding allegations.
• Using S72.036E when laterality is known — if the right or left femur appears anywhere in the chart, the unspecified code is incorrect. Use S72.034E for the right or S72.035E for the left. Some payers deny S72.036E when the record clearly identifies the side.
• Omitting external cause codes — especially for elderly patients who fell. W-codes document the mechanism and many payers want them on the claim. Omitting them does not cause universal denials, but it does trigger queries from Medicare Advantage plans and some commercial payers.

Pre-submission audits catch these patterns before a claim reaches the clearinghouse. A single rule that flags any open fracture code without a documented Gustilo type will catch most of the list above.

Related ICD-10 codes

These are the codes coders most often weigh against S72.036E. Each one differs by a single documented fact. That fact is the side, the displacement status, the encounter phase, or the healing outcome.

Fractures elsewhere in the femur sit in their own S72 subcategories, such as S72.455S at the lower end. For the whole family, including shaft and trochanteric fractures, start with S72.91XH.

How practice management software supports accurate fracture coding

The facts S72.036E depends on are usually scattered across the chart. The Gustilo type sits in a scanned operative note. Encounter status has to be inferred from the visit reason. Laterality appears in the imaging report but never reaches the diagnosis field.

The coder reconstructs all three, and a wrong reconstruction surfaces weeks later as a denial. Practice management software like Pabau holds those facts in structured fields instead of free text. Custom medical forms can require a Gustilo type and a healing status before an open fracture note is signed.

Appointment types mark post-operative reviews as follow-up visits, so the encounter character stops being a judgment call. Medical records management carries laterality forward from the original injury to every later visit.

The difference shows up in the billing queue. Coders open a note that already answers the three questions the 7th character depends on, so fewer fracture claims come back for a query.

Reduce fracture coding denials with structured documentation

Pabau helps orthopedic, rehabilitation, and multi-specialty practices capture the details coders need at the point of care. Gustilo type, encounter status and laterality reach the chart long before a claim can be denied.

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Conclusion

The 7th character is where this code is won or lost. If your practice can answer two questions at every follow-up visit, S72.036E stops being risky. Was the original wound Gustilo type I or II, and is healing routine?

Those answers come from the original operative note rather than the follow-up visit. So the fix belongs at the initial encounter, months before a coder has to choose a 7th character. Capturing the Gustilo type once makes the whole S72.03 run mechanical.

The trade-off worth remembering is laterality. S72.036E is valid, but an unspecified side invites a query, so use it only when the record genuinely cannot say more. Book a demo to see how Pabau keeps Gustilo type, encounter status and laterality in the chart before your team codes the visit.

Continue your research

Coding a sequela rather than the fracture itself? S43.312S shows how the 7th character S behaves at another injury site.

Billing the fixation procedure alongside the diagnosis? CPT code 20690 covers external fixation and the documentation payers look for.

Injecting a joint during a follow-up visit? CPT code 20550 sets out the billing rules for tendon sheath injections.

Want the claim itself to be easy to review? The superbill template gives you a filled-in example to check your own against.

Facing a fracture that united in the wrong position? S72.452Q applies the malunion character to another part of the femur.

Frequently asked questions

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