I82.1 ICD-10-CM Code: Thrombophlebitis migrans

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for I82.1 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on I82.1 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for I82.1

MedCoder structured workflow — derived from this code’s own official record

Choose the right path

1. Is the underlying (etiologic) condition the Code First note names documented?
   Yes → Sequence the underlying condition first, then I82.1.
   No → Continue; do not add an underlying condition the record does not document.

   ReviewO08.7, O22, O87

Consider I82.1. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

The underlying (etiologic) condition

Named in the Code First note; sequenced before this code when documented (Guidelines I.A.13).

Official instructions as workflow

• Excludes2 — not part of I82.1(9 notes)

  Coding workflow: The conditions named in this note are not included in I82.1. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareI63.6, I67.6, G08, G95.1, K55.0, I81

  See the official tabular notes · Guidelines I.A.12.b

• Code First — sequencing check(3 notes)

  Coding workflow: Check whether the underlying or etiologic condition the note names is documented. When it is, sequence it before I82.1. Do not add an underlying condition the record does not document.

  ReviewO08.7, O22, O87

  See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Indexed Clinical Terms (6)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Phlebitis (infective) (pyemic) (septic) (suppurative), migrans, migrating (superficial)
• Syndrome, carcinogenic thrombophlebitis
• Syndrome, Trousseau's
• Thrombophlebitis, idiopathic, recurrent
• Thrombophlebitis, migrans, migrating
• Trousseau's syndrome (thrombophlebitis migrans)

Don’t confuse I82.1 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of I82.1 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• I63.6— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of cerebral adds I63.6; it is not part of this code and both may be reported when both are documented.

  Full comparison: I82.1 vs I63.6 →

• I67.6— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of cerebral adds I67.6; it is not part of this code and both may be reported when both are documented.

  Full comparison: I82.1 vs I67.6 →

• I21— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of coronary adds I21; it is not part of this code and both may be reported when both are documented.

  Full comparison: I82.1 vs I21 →

• I25— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of coronary adds I25; it is not part of this code and both may be reported when both are documented.

  Full comparison: I82.1 vs I25 →

• G08— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of intracranial and intraspinal, septic or NOS adds G08; it is not part of this code and both may be reported when both are documented.

  Full comparison: I82.1 vs G08 →

• G95.1— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of intraspinal, nonpyogenic adds G95.1; it is not part of this code and both may be reported when both are documented.

  Full comparison: I82.1 vs G95.1 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 202 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 299 (MDC 05), DRG 300 (MDC 05), DRG 301 (MDC 05).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):CIR033 — Acute phlebitis; thrombophlebitis and thromboembolism (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

E13.628 — Other specified diabetes mellitus with other skin complications, E13.630 — Other specified diabetes mellitus with periodontal disease, E13.638 — Other specified diabetes mellitus with other oral complications, E13.649 — Other specified diabetes mellitus with hypoglycemia without coma, E13.65 — Other specified diabetes mellitus with hyperglycemia, E13.69 — Other specified diabetes mellitus with other specified complication, E13.8 — Other specified diabetes mellitus with unspecified complications, I27.841 — Fontan-associated lymphatic dysfunction, I27.848 — Other Fontan-associated condition, I27.849 — Fontan related circulation, unspecified, I82.210 — Acute embolism and thrombosis of superior vena cava, I82.211 — Chronic embolism and thrombosis of superior vena cava, I82.290 — Acute embolism and thrombosis of other thoracic veins, I82.291 — Chronic embolism and thrombosis of other thoracic veins, I82.401 — Acute embolism and thrombosis of unspecified deep veins of right lower extremity, I82.402 — Acute embolism and thrombosis of unspecified deep veins of left lower extremity, I82.403 — Acute embolism and thrombosis of unspecified deep veins of lower extremity, bilateral, I82.409 — Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity, I82.411 — Acute embolism and thrombosis of right femoral vein, I82.412 — Acute embolism and thrombosis of left femoral vein, +181 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Acute phlebitis; thrombophlebitis and thromboembolism).

I80.259 — Phlebitis and thrombophlebitis of unspecified calf muscular vein, I80.291 — Phlebitis and thrombophlebitis of other deep vessels of right lower extremity, I80.292 — Phlebitis and thrombophlebitis of other deep vessels of left lower extremity, I80.293 — Phlebitis and thrombophlebitis of other deep vessels of lower extremity, bilateral, I80.299 — Phlebitis and thrombophlebitis of other deep vessels of unspecified lower extremity, I80.3 — Phlebitis and thrombophlebitis of lower extremities, unspecified, I80.8 — Phlebitis and thrombophlebitis of other sites, I80.9 — Phlebitis and thrombophlebitis of unspecified site, I81 — Portal vein thrombosis, I82.0 — Budd-Chiari syndrome, I82.210 — Acute embolism and thrombosis of superior vena cava, I82.220 — Acute embolism and thrombosis of inferior vena cava, I82.290 — Acute embolism and thrombosis of other thoracic veins, I82.3 — Embolism and thrombosis of renal vein, I82.401 — Acute embolism and thrombosis of unspecified deep veins of right lower extremity, I82.402 — Acute embolism and thrombosis of unspecified deep veins of left lower extremity, I82.403 — Acute embolism and thrombosis of unspecified deep veins of lower extremity, bilateral, I82.409 — Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity, I82.411 — Acute embolism and thrombosis of right femoral vein, I82.412 — Acute embolism and thrombosis of left femoral vein, +106 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Phlebitis”, “Thrombophlebitis”; these codes share that main term but sit in a different category of the Tabular List.

I80.1 — Phlebitis and thrombophlebitis of femoral vein (femoral vein), I80.20 — Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremities (leg, deep NEC), I80.21 — Phlebitis and thrombophlebitis of iliac vein (iliac vein), I80.22 — Phlebitis and thrombophlebitis of popliteal vein (leg, deep NEC, popliteal vein), I80.23 — Phlebitis and thrombophlebitis of tibial vein (tibial vein), I80.24 — Phlebitis and thrombophlebitis of peroneal vein (peroneal vein), I80.25 — Phlebitis and thrombophlebitis of calf muscular vein (soleal vein), I80.29 — Phlebitis and thrombophlebitis of other deep vessels of lower extremities (lower extremity, deep), I80.3 — Phlebitis and thrombophlebitis of lower extremities, unspecified (leg), I80.8 — Phlebitis and thrombophlebitis of other sites (umbilicus), I80.9 — Phlebitis and thrombophlebitis of unspecified site, K75.1 — Phlebitis of portal vein (portal), O08.0 — Genital tract and pelvic infection following ectopic and molar pregnancy (pelvic, with ectopic or molar pregnancy), O22.2 — Superficial thrombophlebitis in pregnancy (antepartum), O22.3 — Deep phlebothrombosis in pregnancy (antepartum, deep), O22.5 — Cerebral venous thrombosis in pregnancy (cavernoussinus, complicating pregnancy), O86.81 — Puerperal septic thrombophlebitis (puerperal, postpartum, childbirth, septic), O87.0 — Superficial thrombophlebitis in the puerperium (puerperal, postpartum, childbirth), O87.1 — Deep phlebothrombosis in the puerperium (pelvic, puerperal), T81.72 — Complication of vein following a procedure, not elsewhere classified (postoperative), +6 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Gamma-glutamyl Transferase (GGT) Test, Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of I82.1 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

• I00-I99 — Chapter 9: Diseases of the Circulatory System (I00-I99) (I00-I99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I80-I89 — Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Clinical classification (CCSR)

• CIR033 — Acute phlebitis; thrombophlebitis and thromboembolism[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 299 — PERIPHERAL VASCULAR DISORDERS WITH MCC[MS-DRG]: “PERIPHERAL VASCULAR DISORDERS WITH MCC (MDC 05)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 300 — PERIPHERAL VASCULAR DISORDERS WITH CC[MS-DRG]: “PERIPHERAL VASCULAR DISORDERS WITH CC (MDC 05)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 301 — PERIPHERAL VASCULAR DISORDERS WITHOUT CC/MCC[MS-DRG]: “PERIPHERAL VASCULAR DISORDERS WITHOUT CC/MCC (MDC 05)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 05 — Diseases and Disorders of the Circulatory System[MDC crossing]: “Diseases and Disorders of the Circulatory System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 17,209 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Phlebitis (infective) (pyemic) (septic) (suppurative), migrans, migrating (superficial)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Syndrome, carcinogenic thrombophlebitis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Syndrome, Trousseau's[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Thrombophlebitis, idiopathic, recurrent[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Thrombophlebitis, migrans, migrating[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Trousseau's syndrome (thrombophlebitis migrans)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

• I82 — Other venous embolism and thrombosis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.0 — Budd-Chiari syndrome[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.2 — Embolism and thrombosis of vena cava and other thoracic veins[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.21 — Embolism and thrombosis of superior vena cava[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.210 — Acute embolism and thrombosis of superior vena cava[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.211 — Chronic embolism and thrombosis of superior vena cava[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.22 — Embolism and thrombosis of inferior vena cava[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• I82.220 — Acute embolism and thrombosis of inferior vena cava[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I82.1 in its code family, with their registry titles.

• I82 — Other venous embolism and thrombosis
• I82.0 — Budd-Chiari syndrome
• I82.2 — Embolism and thrombosis of vena cava and other thoracic veins
• I82.21 — Embolism and thrombosis of superior vena cava
• I82.210 — Acute embolism and thrombosis of superior vena cava
• I82.211 — Chronic embolism and thrombosis of superior vena cava
• I82.22 — Embolism and thrombosis of inferior vena cava
• I82.220 — Acute embolism and thrombosis of inferior vena cava
• I82.221 — Chronic embolism and thrombosis of inferior vena cava
• I82.29 — Embolism and thrombosis of other thoracic veins

View all codes in the I82 family