M19.042 ICD-10-CM Code: Primary osteoarthritis, left hand
M19.042 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Osteoarthritis (M15-M19)
M19.042
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidancePrimary osteoarthritis, left hand
Wear and tear arthritis in the left hand caused by aging and joint use over time, affecting the cartilage and bones.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for M19.042. Check the code and parent instructions in the Code Book.
Excludes 2
Official- arthropathic psoriasis (L40.5-)Inherited from M00-M99, M15-M19, M19, M19.04
- certain conditions originating in the perinatal period (P04-P96)Inherited from M00-M99, M15-M19, M19, M19.04
- certain infectious and parasitic diseases (A00-B99)Inherited from M00-M99, M15-M19, M19, M19.04
- compartment syndrome (traumatic) (T79.A-)Inherited from M00-M99, M15-M19, M19, M19.04
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from M00-M99, M15-M19, M19, M19.04
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from M00-M99, M15-M19, M19, M19.04
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from M00-M99, M15-M19, M19, M19.04
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from M00-M99, M15-M19, M19, M19.04
- neoplasms (C00-D49)Inherited from M00-M99, M15-M19, M19, M19.04
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from M00-M99, M15-M19, M19, M19.04
- osteoarthritis of spine (M47.-)Inherited from M00-M99, M15-M19, M19, M19.04
- arthrosis of spine (M47.-)Inherited from M00-M99, M15-M19, M19, M19.04
- hallux rigidus (M20.2)Inherited from M00-M99, M15-M19, M19, M19.04
- primary osteoarthritis of first carpometacarpal joint (M18.0-, M18.1-)Inherited from M00-M99, M15-M19, M19, M19.04
Related Codes
Includes
OfficialNo Includes notes are included in this display for M19.042. Check the code and parent instructions in the Code Book.
Excludes 1
Official- polyarthritis (M15.-)Inherited from M19
Code First
OfficialNo Code First sequencing instructions are included in this display for M19.042. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for M19.042. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for M19.042. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is M19.042 an HCC code?
No. M19.042 is a billable ICD-10-CM code with no mapping under the current CMS-HCC V28 community payment model, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- M19.042
- Description
- Primary osteoarthritis, left hand
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
Get the V28 mapping + MEAT cheat sheet
One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.
Free PDF. No card. Unsubscribe anytime.
What This Code Means
M19.042 is the ICD-10-CM diagnosis code for primary osteoarthritis, left hand. Wear and tear arthritis in the left hand caused by aging and joint use over time, affecting the cartilage and bones. M19.042 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering osteoarthritis (m15-m19).
M19.042 is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
Verify laterality is documented as left hand in the clinical record.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M19.042 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify laterality is documented as left hand in the clinical record
- •Ensure this is primary osteoarthritis, not secondary to trauma or other conditions