Maine Coon Color Codes Explained: EMS vs TICA vs CFA (What the Codes Actually Mean)

If you’ve ever looked at a Maine Coon pedigree, breeder page, or registration paperwork and seen something like “MCO a 22,” “ns 11,” or “d 09 24,” you’re not alone. These codes can look like random letters and numbers, but to breeders and registries, they’re a precise shorthand for a cat’s breed, coat color, pattern, and white spotting.

This guide explains the most common system you’ll see online (EMS-style codes), then shows how TICA and CFA tend to describe coats differently, so you can translate what you’re looking at with confidence.

Quick Answer

Maine Coon color codes are shorthand systems used by registries and breeders to describe breed + base color + modifiers (like silver) + pattern + white markings. EMS-style coding uses a format like MCO ns 22, while other registries may use different naming systems or class references.

The 3 Parts of Most Color Codes (The Cheat Code)

Most EMS-style Maine Coon codes are built from:

1. Base color letter (n/a/d/e/f/g etc.)

2. Modifiers (like silver “s” or golden “y”)

3. Numbers (tabby pattern and/or white spotting)

Once you know those pieces, decoding becomes easy.

Part 1: EMS-Style Codes (The Ones That Look Like “MCO ns 22”)

What Does “MCO” Mean?

MCO is the breed code for Maine Coon in EMS-style systems.

Base Color Letters (Most Common)

Here are common EMS base color letters you’ll see for Maine Coons:

• n = black (also the base for brown tabby)

• a = blue (dilute black)

• d = red

• e = cream (dilute red)

• f = black tortie

• g = blue-cream tortie

• w = white

  
  

Modifiers (Extra Letters That Change the Look)

Common modifiers include:

• s = silver (creates silver tabby or smoke effects)

• y = golden (rarer)

  
  

Pattern Numbers (Tabby & Related Patterns)

These numbers describe tabby pattern style:

• 21 = tabby unspecified

• 22 = classic/blotched tabby (swirls)

• 23 = mackerel tabby (stripes)

• 24 = spotted tabby

• 25 = ticked tabby

  
  

You may also see:

• 11 shaded

• 12 shell

  
  

White Spotting Numbers

You’ll often see white spotting shown as 02 / 03 / 09 (and sometimes 01 in other references), describing the amount/location of white.

Real Examples (Decoded)

These are common examples you’ll see in listings and pedigrees:

MCO ns 22

• n = black

• s = silver

• 22 = classic tabby

  
  

  Meaning: Black Silver Classic Tabby Maine Coon.

  
  

MCO a 23

• a = blue

• 23 = mackerel tabby

  
  

  Meaning: Blue Mackerel Tabby Maine Coon.

  
  

MCO d 09 24

• d = red

• 09 = low white spotting

• 24 = spotted tabby

  
  

  Meaning: Red Spotted Tabby with White.

  
  

MCO ns (no pattern number)

Often used to indicate a black smoke look (dark top coat with lighter undercoat).

Part 2: TICA Color Descriptions (Plain-English Naming)

TICA tends to be more description-forward in how owners see the coat labeled (for example: “red with white,” “black silver tabby,” etc.). In practice, many breeders still “think in EMS,” but present a simpler label for families.

TICA examples (easy translations)

• MCO ns 22 (EMS) → Black Silver Classic Tabby (TICA description style)

• MCO a 23 (EMS) → Blue Mackerel Tabby 

• MCO d 09 24 (EMS) → Red Spotted Tabby with White 

  
  

Gandolf example (TICA-style)

For Gandolf (mostly white with red on tail + a couple red spots), the TICA-style description would typically be:

• Red with White (Van) if color is mostly tail/head

• Red with White (Harlequin) if there are a few body patches (like you described)

  
  

Part 3: CFA (Why It Won’t “Match” EMS 1:1)

CFA does not use the same exact letter-number format as EMS for day-to-day labeling, and its registration/classes are not identical to EMS. In other words: the same cat can be accurately described in CFA, but the code structure may look different or be grouped by CFA color classes rather than the EMS string.

Simple takeaway:

• EMS codes are like a compact “coat formula.”

• TICA and CFA often show a more human-readable description or class category, even though the underlying coat genetics are the same.

  
  

Why This Matters (Especially for Buyers)

Understanding codes helps you:

• Know exactly what color/pattern you’re purchasing

• Understand why silver/smoke/shaded cats can change as they mature

• Avoid confusion about what’s accepted for Maine Coons under major registries

• Read pedigrees and listings with confidence

  
  

How to Decode Your Cat’s Color Code at Home (30 Seconds)

Use this quick process:

1. Find the base letter (n/a/d/e…)

2. Look for modifier letters (s = silver, y = golden)

3. Identify pattern numbers (22/23/24/25 etc.)

4. Look for white spotting numbers (02/03/09…)

5. Combine it into one phrase (example: “Black Silver Classic Tabby with White”)