I10 Does Not Map in V28. Hypertensive Heart and CKD Combos Do.

I10 does not map in CMS-HCC V28. Essential (primary) hypertension is billable. The live card shows verified no payable V28 mapping, and there is no `I10` row in the PY2026 V28 map file.

When hypertension coexists with heart disease, CKD, or both, ICD-10-CM Official Guidelines Section I.C.9.a assume a causal relationship unless the provider documents that the conditions are unrelated. That is when the desk moves to I11, I12, or I13 combination codes. Some of those combos map. Some do not. Look the exact code up.

*Current as of September 8, 2026. V28 mapping and CNA factors come from the live code pages named below and `ICD10_CC_mappings_CMS_HCC_2026_v28.csv`. Payment year 2026 is 100% V28. Coefficients are source-labeled references, not member totals. Look the exact codes up. Do not code from this recap. Do not invent a V24 map.*

Quick answer

I10 does not map in CMS-HCC V28. Essential (primary) hypertension is billable under I10. The live card shows verified no payable V28 mapping. There is no row for `I10` in the PY2026 V28 map file.

Look the exact code up. These coefficients are references, not a member total. Hierarchy and cleanup can still drop a category. Do not code from this recap. Current as of September 8, 2026.

What the leftover is asking

Coders treat I10 as if it paid under V28 because hypertension is nearly universal on Medicare charts. It does not. The live I10 card says verified no payable mapping. The file has no `I10` row.

The sequencing leftover is the combo walk:

1. Hypertension alone → I10 (billable, no V28 payment HCC).

2. Hypertension + heart failure → I11.0, then Use Additional I50.- for HF type.

3. Hypertension + heart disease without failure → I11.9 (billable, no V28 payment HCC).

4. Hypertension + CKD → I12.0 or I12.9 by stage, then Use Additional the N18 stage.

5. Hypertension + heart + CKD → I13.0 / I13.10 / I13.11 / I13.2 by HF status and CKD stage, then Use Additional I50.- and/or N18 as the live card lists.

Do not keep I10 on the claim when the note supports a combo and the guidelines require I11 / I12 / I13.

Desk table: which combo maps

Maps (verified live card + CSV, 2026-09-08):

Does not map (verified live card + no CSV row):

I12.9 and I13.10 are still the correct combination codes when the guidelines apply. The CKD payment HCC, when it exists, comes from a mapped N18 stage (or from a combo that itself maps, such as I12.0 / I13.11 / I13.2). See the CKD coding guide.

Use Additional: I50 and N18 with file rows

When the I11.0 / I13.0 / I13.2 card lists Use Additional I50.-, pick the HF type the note supports. Sample verified I50 rows in this desk set:

I11.0 plus a mapped I50.- does not open a second HCC 226. One HF category when both sit in 226.

N18 stages with verified file rows (when the note supports that stage):

No V28 row: N18.1, N18.2, N18.9 (`N181` / `N182` / `N189`). Look the card up / no PY2026 V28 file row. Do not invent an HCC. I12.9 / I13.0 / I13.10 Use Additional still asks for those stage codes clinically when documented.

I12 Excludes2 names acute kidney failure (N17.-). Do not pull N17 into the hypertensive CKD combination.

Parent-range tobacco Use Additional notes (Z77.22, Z87.891, and related) can appear on I10-I13 cards. They do not create a V28 payment HCC for this desk.

MEAT

An HCC mapping does not establish reportability. Review the full eligible record and apply the official coding, encounter, program and payer requirements. A problem-list row from last year does not carry the HCC forward. See MEAT and problem lists.

For this desk, the note should support hypertension this calendar year, plus heart failure and/or CKD when you assign I11 / I12 / I13. Query if the record lists "HTN" and "CKD" or "HF" without enough detail to pick the combo and stage.

Common misses

1. Expecting I10 to pay under V28. It does not. No file row.

2. Coding I10 + N18 or I10 + I50 instead of the required I12 / I11 / I13 combination.

3. Assigning I11.9, I12.9, or I13.10 a V28 payment HCC. Live cards: not mapped.

4. Using I12.9 when stage 5 or ESRD is documented. That is I12.0 (maps 326).

5. Using I11.0 when CKD is also present. Move to I13.0 or I13.2.

6. Forgetting Use Additional I50.- on I11.0 / I13.0 / I13.2, or Use Additional N18 stage on I12 / I13 cards that list it (I13.0 needs both I50.- and N18.1-N18.4 or N18.9).

7. Inventing a V24 map. Select the historical period on the live card. Do not invent.

8. Inventing HCCs for N18.1 / N18.2 / N18.9. No file rows.

9. Copying a problem-list I11.0 or I12.0 with no MEAT this calendar year.

10. Reading only one schema prop on I13.2 and dropping HCC 226. FAQ + CSV keep both 226 and 326.

Two-minute check

1. Does the note support hypertension alone, or hypertension plus heart disease / HF / CKD?

2. If HF without CKD: I11.0 + Use Additional I50.-. Confirm CSV / card → HCC 226.

3. If heart disease without HF and without CKD: I11.9. No V28 payment HCC.

4. If CKD without heart disease: I12.0 (stage 5/ESRD → 326) or I12.9 (stages 1-4/unspecified → no map) + Use Additional N18 stage.

5. If heart + CKD: I13.0 / I13.10 / I13.11 / I13.2 by HF and stage. Confirm maps only where CSV rows exist.

6. Name N18 HCCs only for stages with file rows. N18.1 / N18.2 / N18.9: look the card up.

7. MEAT this year. Do not invent a V24 row. Do not treat I10 as a V28 payment HCC.