S71.151A vs S71.159A

S71.151A (Open bite, right thigh, initial encounter) compared with S71.159A (Open bite, unspecified thigh, initial encounter), from the official CMS tabular data.

Summary

These codes name the same condition on opposite sides of the body, so the documented side decides which one applies.

MedCoder-derived

What is different?

Title wording.The titles differ in one word, “right” (S71.151A) versus “unspecified” (S71.159A): S71.151A is “Open bite, right thigh, initial encounter”; S71.159A is “Open bite, unspecified thigh, initial encounter”.

Registry fact

Can these codes be reported together?

One side per condition.S71.151A and S71.159A name the same condition on opposite sides of the body. Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

MedCoder-derivedGuide: Laterality coding

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. S71.151A carries 3 Excludes1 notes and S71.159A carries 3 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. S71.151A carries 7 Excludes2 notes and S71.159A carries 7 Excludes2 notes covering other codes; the side-by-side table quotes them.

Official rule

Is one more specific?

Yes.S71.151A’s title names the condition; S71.159A’s title is the unspecified form (“Open bite, unspecified thigh, initial encounter”).

MedCoder-derivedGuide: Other vs unspecified (NEC vs NOS)

Is one a parent or header code?

No.Both are billable codes, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

Yes.Same condition, opposite side. S71.151A and S71.159A name the same condition on opposite sides of the body.

MedCoder-derivedGuide: Laterality coding

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule.

Can these codes be reported together?

Review

Laterality relationship

S71.151A

Right

Open bite, right thigh, initial encounter

↔

S71.159A

Unspecified

Open bite, unspecified thigh, initial encounter

What we found

Same condition, opposite side.S71.151A and S71.159A name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

What to review

Report the side the documentation names. Where the code set provides a bilateral code and both sides are documented, use it instead of the pair.

Guide: Laterality coding Check these on a claim

Why it matters

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source / rule

ICD-10-CM tabular list (laterality variant derived from the code title)

Side by side

	S71.151AOpen bite, right thigh, initial encounter	S71.159AOpen bite, unspecified thigh, initial encounter
Billing status	Billable	Billable
Classification	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
Definition	Open bite, right thigh, initial encounter is a billable ICD-10-CM diagnosis code (S71.151A).	Open bite, unspecified thigh, initial encounter is a billable ICD-10-CM diagnosis code (S71.159A).
7th character	The appropriate 7th character is to be added to each code from category S71	The appropriate 7th character is to be added to each code from category S71
Excludes1	superficial bite of thigh (S70.37-) open fracture of hip and thigh (S72.-) traumatic amputation of hip and thigh (S78.-)	superficial bite of thigh (S70.37-) open fracture of hip and thigh (S72.-) traumatic amputation of hip and thigh (S78.-)
Excludes2	bite of venomous animal (T63.-) open wound of ankle, foot and toes (S91.-) open wound of knee and lower leg (S81.-) burns and corrosions (T20-T32) frostbite (T33-T34) snake bite (T63.0-) venomous insect bite or sting (T63.4-)	bite of venomous animal (T63.-) open wound of ankle, foot and toes (S91.-) open wound of knee and lower leg (S81.-) burns and corrosions (T20-T32) frostbite (T33-T34) snake bite (T63.0-) venomous insect bite or sting (T63.4-)
Code also	any associated wound infection	any associated wound infection

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources