Deep Vein Thrombosis and Thrombophlebitis

Advice published in the Third Quarter 1991 and First Quarter 1992 issues of Coding Clinic stated that if both thrombosis and thrombophlebitis are included in the physician’s diagnostic statement, only a code from category 451, Phlebitis and thrombophlebitis should be reported. The advice was supported by the excludes note at category 453, Other venous embolism and thrombosis, which directed the coder to assign only a code from category 451, if both are present. However, effective October 1, 2009, that excludes note was deleted. Based on that change, if the physician documents both thrombophlebitis and deep venous thrombosis (DVT) to be present, how should these conditions be coded? ...

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Note:  The following article synopsis was NOT provided by the AHA. It was created by Find-A-Code/innoviHealth.

Article Overview

This premium coding article reviews how published guidance changed over time for reporting venous thrombosis and thrombophlebitis when both are documented together. It is relevant to coders, auditors, and reimbursement staff who need to understand how older Coding Clinic advice and later ICD-10-related changes affect diagnosis code selection. The article focuses on the policy background, the affected diagnosis categories, and the question of how the change alters reporting when both conditions are present.

Why This Topic Matters

Understanding these guideline changes helps prevent outdated coding practices and supports consistent diagnosis reporting when documentation includes multiple venous conditions. It is especially important for maintaining coding accuracy across different guideline eras and source references.

Article Sections

  1. Historical Coding Clinic guidance

    Summarizes earlier published advice addressing documentation that includes both venous thrombosis and thrombophlebitis. It also references the source of that advice within Coding Clinic issues.

  2. Later change to exclusion guidance

    Describes a subsequent update tied to an effective date that removed a prior exclusion note. This section sets up the question of how coding should be approached after the change.

What You Will Learn

  • How the article frames historical versus updated diagnosis coding guidance
  • Which guideline change is central to the article’s coding question
  • Why the article is relevant to coding both venous thrombosis and thrombophlebitis documentation
  • How Coding Clinic and an effective-date change are used to explain the issue

Who Should Read This

  • Medical coders
  • Coding auditors
  • Revenue cycle staff
  • Compliance professionals
  • Coding educators

Codes Discussed

  • ICD-9-CM: 451
  • ICD-9-CM: 453

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