2027 ICD-10-CM Diagnosis Code I87.312Chronic venous hypertension (idiopathic) with ulcer of left lower extremity

ICD-10-CM Codes›I00–I99›I80-I89›I87

ICD-10-CM I87.312
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I87.312 is a billable ICD-10-CM diagnosis code for chronic venous hypertension (idiopathic) with ulcer of left lower extremity. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 299 through 301. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 58 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postthrombotic syndrome and venous insufficiency/hypertension.

For Medicare Advantage risk adjustment, I87.312 maps to CMS-HCC Category 383 (Chronic Ulcer of Skin, Except Pressure, Not Specified as Through to Bone or Muscle) under the V28 model, adding a risk factor of about 0.646 for a community, non-dual, aged beneficiary in payment year 2027.

Code Identity

ICD-10-CM Code
I87.312
Billable Status
Yes — Valid for Submission
Code Describes
Chronic venous hypertension (idiopathic) with ulcer of left lower extremity
Short Description
Chronic venous hypertension w ulcer of l low extrem
Parent Code
I87.31
Chronic venous hypertension (idiopathic) with ulcer

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI87Other disorders of veins
This CodeI87.312Chronic venous hypertension (idiopathic) with ulcer of left lower extremity

Medicare Risk Adjustment (HCC)Billing

I87.312 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.

CMS-HCC V28 Category (Payment Model)
HCC 383— Chronic Ulcer of Skin, Except Pressure, Not Specified as Through to Bone or Muscle
Payment HCC · PY 2027 one of 308 ICD-10-CM codes in this category
Risk Adjustment Factor (RAF) Weight
+0.646
community, non-dual, aged · ranges 0.343–0.890 across segments
Hierarchy
Superseded by HCC 263, HCC 379, HCC 380, HCC 381, and HCC 382
a more severe related category takes the payment when both are reported
Prior Model (CMS-HCC V24)
HCC 107
V24 retired V28 pays 100% of MA risk scores since PY 2026
Other CMS Models
PACE (CMS-HCC V22): HCC 107 · ESRD (V21): HCC 107 · ESRD (V24): HCC 107
ESRD V21 weights: 0.126 dialysis, 0.300–0.431 functioning graft · ESRD V24 weights: 0.144 dialysis, 0.324–0.586 functioning graft
Part D (RxHCC)
Not mapped
I87.312 does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I87.312: its own notes plus those printed at I87.31, I87.3, and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From I87.3 Chronic venous hypertension (idiopathic) applies to 20 codes
  • chronic venous hypertension due to deep vein thrombosis (I87.0-)
  • varicose veins of lower extremities (I83.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From I87.31 Chronic venous hypertension (idiopathic) with ulcer applies to 4 codes
  • code to specify site and severity of ulcer (L97.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I87.312, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming I87.312: they are not reported together with it, unless the two conditions are unrelated.

  • I87.0 Postthrombotic syndrome
    chronic venous hypertension without deep vein thrombosis (I87.3-) names I87.3-, which includes this code

Code First 1

These codes say to code first a condition named in the note, and I87.312 is one of the conditions named.

  • L97 Non-pressure chronic ulcer of lower limb, not elsewhere classified
    chronic venous hypertension (I87.31-, I87.33-) names I87.31-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR036
Postthrombotic syndrome and venous insufficiency/hypertension
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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Convert I87.312 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
459.31 Chr venous hyper w ulcer
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I87.312Overview

Is I87.312 (Chronic venous hypertension (idiopathic) with ulcer) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic venous hypertension (idiopathic) with ulcer of left lower extremity on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I87.312 group to?

When chronic venous hypertension (idiopathic) with ulcer of left lower extremity is the principal diagnosis on an inpatient stay, it groups to MS-DRG 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.

Is I87.312 a CC or MCC?

CMS lists I87.312 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 58 closely related codes in its exclusion list.

Can I87.312 be reported with a code from I87.0?

Not as a rule. The Excludes1 note at I87.3, which applies to I87.312, lists "chronic venous hypertension due to deep vein thrombosis (I87.0-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does I87.312 need an additional code?

When the condition applies, yes. The Use Additional Code note at I87.31, which applies to I87.312, reads: code to specify site and severity of ulcer (L97.-). The additional code is reported after I87.312.

What HCC is I87.312?

I87.312 (chronic venous hypertension (idiopathic) with ulcer of left lower extremity) maps to CMS-HCC Category 383 (Chronic Ulcer of Skin, Except Pressure, Not Specified as Through to Bone or Muscle), commonly written as HCC 383, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 107 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.

Does I87.312 risk-adjust for Medicare Advantage payment?

Yes. When documented and reported on a Medicare Advantage encounter, I87.312 adds a risk adjustment factor of about 0.646 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.343 to 0.890 depending on the payment segment). A more severe related category (HCC 263, HCC 379, HCC 380, HCC 381, and HCC 382) supersedes it when both are reported. See the full factor table on the HCC 383 category page.